Clinical Anatomy > Deep Back > Flashcards

Deep Back Flashcards

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1
Q

Vertebral canal

A

Canal formed by vertebral foramina of vertebral bodies

  • Houses spinal cord
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2
Q

Vertebral foramen

A

Hole formed by vertebral arch + posterior surface of vertebral body

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3
Q

Intervertebral foramen

A

Hole formed by superior + inferior notches of adjacent vertebrae

  • Passage for spinal nerve roots + vessels
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4
Q

Epidural space

A

Extradural space separating dura mater from vertebrae

  • Location for epidural anesthesia (epidurals)
  • Filled with epidural fat + vessels
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5
Q

Dura mater spinalis

A

Outermost cover of spinal cord

  • Tough, fibrous, elastic tissue
  • Pierced by spinal nerves
  • Forms spinal dural sac starting from margin of foramen magnum + adheres to coccyx by filum terminale externum
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6
Q

Arachnoid mater spinalis

A

Middle cover of spinal cord

  • Delicate, fibrous, elastic
  • Encloses CSF in subarachnoid space
  • Not attached to DMS but pressed tightly against it by pressure from CSF
  • Lumbar puncture occurs in subarachnoid space
  • Dura-arachnoid space is not really a space but rather a weak cell layer
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7
Q

Pia mater spinalis

A

Innermost cover of spinal cord

  • Consists of flattened cells w/ long equally flattened processes that closely follow all surface features of SC
  • Also directly covers all roots of spinal nerves + blood vessels
  • Inferior to conus medullaris, continues as filum terminale
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8
Q

Conus medullaris

A

Tapered end of spinal cord

  • Typically L1-L2
  • High as T12
  • Low as L3
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9
Q

Cauda equina

A

Bundle of spinal nerve roots below conus medullaris

*Resembles horsetail

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10
Q

Filum terminale

A

Extends from conus medullaris + anchors spinal cord + dural sac

  • Consists primarily of pia mater
  • Internum: Inside dural sac
  • Externum: Outside dural sac (takes on layers of arachnoid + dura)
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11
Q

Denticulate ligaments

A

Extension of pia mater midway on either side that suspends spinal cord in dural sac

*Runs longitudinally along either side of spinal cord

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12
Q

Posterior roots of spinal nerves

A

Contain sensory (afferent) fibers

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13
Q

Anterior roots of spinal nerves

A

Contain motor (efferent) fibers

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14
Q

Dorsal root ganglion

A

Cluster of cell bodies of sensory neurons

*also known as spinal ganglion

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15
Q

Posterior longitudinal ligament

A

Location:
- Longitudinal ligament in between vertebral body and spinal cord

Function:
- Prevent hyperflexion of spine + posterior herniation of IV discs

*weaker than anterior

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16
Q

Ligamentum flavum

A
  • Pale, yellow elastic fibrous tissue connecting vertebral arches, laminae to laminae
  • Forms alternating sections of the posterior wall of vertebral canal
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17
Q

Sacrum

A

5 fused sacral bones

  • S1 landmark = sacral promontory
  • Fused SPs = median sacral crest
  • Fused APs = intermediate sacral crest
  • Fused TPs = lateral sacral crest
  • Sacral hiatus = inverted U-shape (absence of L4-L5 laminae + SPs)
  • Sacral cornua = inferior AP
  • 4 posterior + 4 anterior foramina
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18
Q

Transverse scapular ligament

A

Crosses suprascapular notch

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19
Q

Spinal accessory nerve (CN XI)

A

Innervates:

- Trapezius

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20
Q

Dorsal scapular nerve

A

Innervates:

  • Rhomboid major
  • Rhomboid minor
  • Levator scapulae
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21
Q

Superficial branch of transverse cervical artery

A

Supplies:
- Trapezius

*Runs with spinal accessory nerve

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22
Q

Dorsal scapular artery

A

Supplies:

  • Rhomboid major
  • Rhomboid minor
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23
Q

Suprascapular artery + nerve

A

Location:
- Above + below transverse scapular ligament

Supplies:

  • Supraspinatus
  • Infraspinatus
  • Teres minor
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24
Q

Vertebral artery

A

Location:
- Suboccipital triangle

Supplies:
- Suboccipital muscles

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25
Deltoid (origin + insertion)
Origin: - Lateral 1/3 clavicle - Acromion - Spine of scapula Insertion: - Deltoid tuberosity of humerus
26
Deltoid (function + innervation)
Function: - Anterior - flex + medially rotate shoulder joint - Middle - ABduct shoulder joint (to 90 degrees) - Posterior - extend + laterally rotate shoulder joint Innervation: - Axillary nerve (C5) (C6)
27
Teres major (origin + insertion)
Origin: - Inferior part of lateral border of scapula - Posterior surface of inferior angle of scapula Insertion: - Medial lip of intertubercular sulcus of humerus
28
Teres major (function + innervation + vascularization)
Function: - ADduct shoulder joint - Medial (internal) rotation of shoulder joint Innervation: - Lower subscapular nerve (C5) (C6) Vascularization: - Thoracodorsal branch of the subscapular artery - Posterior circumflex humeral artery
29
Teres minor (origin + insertion)
Origin: - Middle part of lateral border of scapula Insertion: - Inferior facet of greater tubercle of humerus
30
Teres minor (function + innervation + vascularization)
Function: - Laterally rotate shoulder joint - Help hold humeral head in glenoid cavity Innervation: - Axillary nerve (C5) (C6) Vascularization: - Suprascapular artery - Dorsal scapular artery
31
Biceps brachii, short + long heads (origin + insertion)
Origin: - Short: Tip of coracoid process of scapula - Long: Supraglenoid tubercle of scapula Insertion: - Radial tuberosity of radius - Deep fascia of forearm via bicipital aponeurosis
32
Biceps brachii, short + long heads (function + innervation + vascularization)
Function: - Supinate forearm - Flex elbow joint in supinated position - Flex shoulder joint (weak) - Short head resists dislocation of shoulder Innervation: - Musculocutaneous nerve (C6) (C5) Vascularization: - Branches of brachial artery
33
Triceps brachii, long + lateral + medial heads (origin + insertion)
Origin: - Long: Infraglenoid tubercle of scapula - Lateral: Posterior surface of humerus, superior to radial groove - Medial: Posterior surface of humerus, inferior to radial groove Insertion: - Proximal end of olecranon of ulna - Fascia of forearm
34
Triceps brachii, long + lateral + medial heads (function + innervation + vascularization))
Function: - Chief extensor of elbow joint - Long head extends shoulder joint + resists dislocation of humerus (esp during ABduction) Innervation: - Radial nerve (C7, C8) (C6) Vascularization: - Deep brachial artery - Superior ulnar collateral artery
35
Supraspinatus (origin + insertion)
Origin: - Supraspinous fossa of scapula Insertion: - Superior facet of greater tubercle of humerus
36
Supraspinatus (function + innervation + vascularization)
Function: - ABduction of shoulder joint (to 15 degrees) - Act w/ other RC muscles Innervation: - Suprascapular nerve (C5) (C4, C6) Vascularization: - Suprascapular artery
37
Infraspinatus (origin + insertion)
Origin: - Infraspinous fossa of scapula Insertion: - Middle facet of greater tubercle of humerus
38
Infraspinatus (function + innervation + vascularization)
Function: - Laterally rotate shoulder joint - Help hold humeral head in glenoid cavity (RC) Innervation: - Suprascapular nerve (C5) (C6) Vascularization: - Suprascapular artery - Circumflex scapular arteries
39
Subscapularis (origin + insertion)
Origin: - Subscapular fossa (most of anterior surface of scapula) Insertion: - Lesser tubercle of humerus
40
Subscapularis (function + innervation + vascularization)
Function: - Medially rotate + ADduct shoulder joint - Help hold humeral head in glenoid cavity (RC) Innervation: - Upper and lower subscapular nerves (C6) (C5, C7) Vascularization: 1) Suprascapular artery 2) Axillary artery 3) Subscapular artery
41
Obliquus capitis superior (ID)
Lateral side of suboccipital triangle | *Smaller than inferior
42
Obliquus capitis inferior (ID)
Inferior side of suboccipital triangle | *Larger than superior
43
Rectus capitis posterior minor (ID)
Most medial, above rectus capitis major
44
Rectus capitis posterior major (ID)
Superior side of suboccipital triangle | *Lateral to the minor
45
Suboccipital triangle (borders)
Sides (clockwise starting at 12:00): 1) Rectus capitis posterior major 2) Obliquus capitis inferior 3) Obliquus capitis superior
46
Splenius capitis (origin + insertion)
Origin: - Nuchal ligament - SPs of C7-T3 Insertion: - Mastoid process - Lateral 1/3 superior nuchal line of occipital bone
47
Splenius capitis (function + innervation + vascularization)
Function: - Unilateral = Lateral flexion neck + rotate head to side of active muscle - Bilateral = Extend head + neck Innervation: - Dorsal rami of spinal nerves Vascularization: - Muscular branches of occipital artery
48
Omohyoid
Origin: - Superior border of scapula Insertion: - Body of hyoid bone Function: - Depress hyoid Innervation: - Anterior rami of spinal nerves C1-C3 Vascularization: - Superior thyroid artery
49
Which rami innervates the deep back muscles?
Posterior rami
50
3 groups of deep (intrinsic) back muscles
1) Erector spinae 2) Transversospinalis 3) Splenius
51
3 groups of erector spinae muscles (+ location)
1) Iliocostalis (outer) 2) Longissimus (middle) 3) Spinalis (inner)
52
3 groups of transversospinalis muscles (relative location + innervation)
Relative location: 1) Semispinalis (superficial) 2) Multifudus (deeper) 3) Rotatores (deepest) * Connect btwn TPs to more superior SPs Innervation: - Dorsal rami of spinal nerves
53
2 groups of splenius muscles
1) Capitis | 2) Cervicis
54
Erector spinae (function + innervation)
Bilateral function: - Extend VC - Extend head - Control flexion of VC Unilateral function: - Lateral bend of VC Innervation: - Dorsal rami of spinal nerves
55
Suboccipital muscle innervation
``` Suboccipital nerve (C1 dorsal ramus) *Located in suboccipital triangle ```
56
Obliquus capitis superior (origin + insertion + innervation + vascularization)
Origin: - TP of C1 Insertion: - Lateral part of inferior nuchal line on occipital bone Innervation: - Suboccipital nerve (posterior ramus of spinal nerve C1) Vascularization: - Vertebral artery and descending branches of the occipital artery
57
Obliquus capitis inferior (origin + insertion + innervation + vascularization)
Origin: - SP of C2 Insertion: - TP of C1 * Meets up with the superior Innervation: - Posterior ramus of spinal nerve C1 (suboccipital nerve) Vascularization: - Vertebral artery and deep descending branches of the occipital artery
58
Rectus capitis posterior minor (origin + insertion + innervation + vascularization)
Origin: - Posterior tubercle of C1 Insertion: - Medial part of inferior nuchal line on occipital bone Innervation: - Posterior ramus of spinal nerve C1 (suboccipital nerve) Vascularization: - Vertebral artery - Occipital artery (via the deep descending branch)
59
Rectus capitis posterior major (origin + insertion + innervation + vascularization)
Origin: - Spinous process of C2 Insertion: - Lateral part of inferior nuchal line on occipital bone Innervation: - Suboccipital nerve (posterior ramus of spinal nerve C1) Vascularization: - Vertebral artery and descending branches of the occipital artery
60
Quadrangular space (borders + contents)
Borders: - Teres minor (inf) - Teres major (sup) - Long head of triceps (lat) - Humerus (med) Contents: - Axillary nerve - Posterior humeral circumflex artery (+vein)
61
Triangular space (borders + contents)
Borders: - Teres minor (inf) - Teres major (sup) - Long head of triceps (med) Contents: - Circumflex scapular artery (+ vein)
62
Splenius cervicus (function + innervation)
Function: - Unilateral: Lateral flexion and rotation of neck - Bilateral: Extension of neck Innervation: - Dorsal rami of spinal nerves
63
Splenius cervicus (origin + insertion)
Origin: - Spinous processes of T3 – T6 vertebrae Insertion: - Transverse processes of C1 – C3 vertebrae
64
Erector spinae (origin + insertion)
Origin: - Iliac crest (posterior broad tendon) - Sacrum (posterior surface) - Sacro-iliac ligaments - Spinous processes of sacral + inferior lumbar vertebrae - Supraspinous ligament Insertion: - Iliocostalis - Superiorly to angles of lower ribs + cervical TPs - Longissimus - Mastoid process + superiorly to ribs btwn tubercles + angles to thoracic + cervical TPs - Spinalis - Superiorly to SPs in upper thoracic region + to cranium
65
What is the most commonly torn tendon of the rotator cuff?
Supraspinatus
66
What muscle is utilized up to 15 degrees abduction of the shoulder joint?
Supraspinatus
67
What muscle is utilized with 15-90 degrees abduction of the shoulder joint?
Deltoid
68
What muscles are utilized with abduction of the shoulder joint past 90 degrees?
- Trapezius | - Serratus anterior
69
Walk through steps of a lumbar puncture
1) ID L4 level (iliac crest) 2) Pierce skin 3) Supraspinous ligament 4) Infraspinous ligament 5) Ligamentum flavum 6) Epidural space 7) Dura/arachnoid mater STOP! *CSF in subarachnoid space
70
What are the four muscles of the rotator cuff?
- Supraspinatus - Infraspinatus - Teres minor - Subscapularis *SITS
71
Subclavius (origin + insertion)
Origin: - 1st rib Insertion: - Bottom surface of the middle part of the clavicle.
72
Subclavius (function + innervation)
Function: - Stabilise the clavicle during movements of the pectoral girdle - Depress lateral end of the clavicle & pull it slightly anteriorly Innervation: - Nerve to subclavius
73
What defines the triangle interval?
- Teres major - Long head of triceps - Lateral head of the triceps
74
What are the contents of the triangle interval?
- Radial nerve | - Deep branch of brachial artery
75
What nerve innervates the suboccipital muscles?
Suboccipital nerve (C1 dorsal ramus)
76
What are the contents of the suboccipital triangle?
- Vertebral artery | - Suboccipital nerve (C1 dorsal ramus)
77
Where does the spinal cord terminate?
L1-L2
78
Do cervical nerves exit above or below the vertebra with the same number?
Above - C8 exits between C7 + T1
79
Do thoracic and lumbar spinal nerves exit above or below the vertebra with the same number?
Below
80
Anterior longitudinal ligament
Location: - Anterior to vertebral column Function: - Prevent hyperextension of spine + anterior herniation of IV discs
81
Which nerve root would a posterolateral herniation of the nucleus pulposus impinge upon?
Tranversing nerve root
82
How do the rotator cuff muscles stabilize the shoulder joint?
Form a musculotendoninous cuff around the GH joint
83
White matter
- Contains only tracks of myelinated + unmyelinated axons traveling to + from the brain
84
Gray matter
- Contains neuronal cell bodies + their dendrites, along with axons + central neuroglia
85
Where are the cell bodies of motor neurons that innervate skeletal muscle located?
- Ventral horn of the gray matter
Clinical Anatomy
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