Anatomy Week 3 Cervical plexuses

Question 1

Why are spinal nerves mixed nerves

Answer 1

As they contain both sensory and motor nerves

Question 2

What do anterior roots contain

Answer 2

Motor efferent fibers

Question 3

What does posterior roots contain

Answer 3

Sensory afferent fibers

Question 4

Name the 4 different types of fibers spinal nerves contain

Answer 4

• Somatomotor - efferent fibers
• Visceromotor - efferent
• somatosensory - afferent
• Viscerosensory - afferent

Question 5

What is somatomotor (efferent ) fibers used for

Answer 5

For skeletal muscles

Question 6

What is visceromotor efferent fibers used for

Answer 6

• smooth muscles and glands

Question 7

What is somatosensory afferent fibres used for

Answer 7

Exteroceptive and proprioceptive sensations

Question 8

What is Viscerosensory afferent fibres used for

Answer 8

Internal organ sensations

Question 9

What are visceral efferent fibers+ what is it divided into -

Answer 9

Are autonomic fibers that supply the internal organs they are divided into sympathetic and parasympathetic

Question 10

Where do the sympathetic fibers from visceral efferent fibers originate from

Answer 10

-spinal nerves

Question 11

Where do the parasympathetic fibers from the visceral efferent fibers originate from

Answer 11

• from spinal nerves and cranial nerves

Question 12

What is Dermatome

Answer 12

An area of skin that is supplied by a single spinal nerve

Question 13

What is myotome

Answer 13

A group of muscles supplied by a single spinal nerve

Question 14

Named the branches (4) of a spinal nerve

Answer 14

• Anterior ramus
• Posterior ramus
• Rami communicantes
• Meningeal branches

Question 15

What does the anterior ramus supply

Answer 15

• Anterolateral trunk wall and limbs

Question 16

What does the Posterior ramus supply

Answer 16

• Supplies the skin and muscles of the back and posterior scalp

Question 17

What does the Rami communicantes carry

Answer 17

-It carries autonomic signals

Question 18

Meningeal branches re enter the vertberal canal to innervate what

Answer 18

-Ligaments
-Dura
-Vessels
-Joints
-Vertberae

Question 19

What can the rami communicantes be divided into

Answer 19

Grey rami communicantes
white rami communicantes

Question 20

Where does the grey rami communicantes exist

Answer 20

• At all spinal levels

Question 21

What is the function of the grey rami communicantes

Answer 21

-It carries postganglionic sympathetic fibers from the sympathetic chain to target organs

Question 22

What is the function of the white rami communicantes

Answer 22

• They carry preganglionic fibers from the spinal cord to the sympathetic chain

Question 23

Name the 4 different plexuses inwhich the spinal nerves reorganises into

Answer 23

• Cervical plexus
  -Brachial plexus
  -Lumbar plexus
  -Sacral plexus

Question 24

Does the thoracic spinal nerves from plexuses

Answer 24

No

Question 25

What does the thoracic spinal nerves give rise to

Answer 25

Intercostal nerves

Question 26

What is the cervical plexus roots formed by

Answer 26

Anterior rami of C1 - C4

Question 27

Name the cervical branch that contributes to the phrenic nerve

Answer 27

C5

Question 28

Name the muscles innervated by the Ansa Cervicalis

Answer 28

- Sternohyoid Sternothyroid Omohyoid

Question 29

Name 2 muscles that innervate via hypoglossal nerve

Answer 29

Thyrohyoid Geniohyoid