PRAC.18

Question 1

Answer 1

M. psoas minor

Origin: Th₁₀ - L₅

Insertion: Eminentia iliopubica

Action:

• Vertebral column fixed: Pelvis drawn into deeper position
• Pelvis fixed: Arch lumbar region, flex vertebral column

Innervation: N. femoralis

Blood supply: A. iliolumbalis

Question 2

Answer 2

M. psoas major

Origin: Corpus et processus transversus of lumbar vertebrae

Insertion: Trochanter minor of femur

Action: Flex hip, flex/fixate vertebral column

Innervation: N. femoralis

Blood supply: A. Iliolumbalis

Question 3

Answer 3

M. iliacus medialis et lateralis

Origin: Linea arcuata

Insertion: Trochanter minor of femur

Action: Flex hip, flex/fixate vertebral column

Innervation: N. femoralis

Blood supply: A. iliolumbalis

Question 4

Which muscles make up m. iliopsoas?

Answer 4

• M. psoas major
• M. iliacus (med et lat)

Question 5

Answer 5

M. quadratus lumborum

Origin: Th₁₁-Th₁₃, R_11-R₁₃, proc. transversus of Lumbar vertebrae

Insertion: Medial ala ossis illi

Action: Fixation and dorsal flexion of vertebral column

Innervation: N. femoralis

Blood supply: A. iliolumbalis

• Located under the transverse processes of the lumbar vertebrae

Question 6

M. quadratus lumborum is innervated by…

Answer 6

Nn. lumbales rr. ventrales

Question 7

Plexus lumbalis is compose of…

Answer 7

Nn. lumbales

• Eq/Bo/Su: L₁-L6
• Ca/Fe: L₁-L₇

Question 8

R. dorsalis from each n. lumbalis forms…

Answer 8

• R. medialis: Innervate back muscles
• R. lateralis: Innervate skin over the rump

Question 9

R. ventralis from each n. lumbalis forms…

Answer 9

Plexus lumbalis

Question 10

List the components of plexus lumbalis

Answer 10

• N. iliohypogastricus cranialis
• N. iliohypogastricus caudalis
• N. ileoinguinalis
• N. genitofemoralis
• N. cutaneus femoris lateralis
• N. femoralis
• N. obturatorius

Question 11

Which lumbar vertebrae aren’t involved in plexus lumbalis?

Answer 11

L₁-L₃

Question 12

Lumbosacral plexus is composed of…

Answer 12

L₄ - S₂

Question 13

Answer 13

N. iliohypogastricus

• From L₁-L₂
• Divided into:
  
  • N. iliohypogastricus cranialis
  • N. iliohypogastricus caudalis
• R. medialis → Inguinal region
• R. lateralis → Skin on abdominal wall

Question 14

Answer 14

N. ilioinguinalis

• From L₃
• Similar path to n. iliohypogastricus

Question 15

Answer 15

N. genitofemoralis

• From L₃-L₄
• Runs between mm. lumbales
• Exits through canalis inguinalis
• Innervates:
  
  • Medial thigh muscles
  • Vulva/scrotum/prepuce
  • Gl. mammaria

Question 16

Answer 16

N. cutaneus femoralis lateralis

• From L₄
• Innervates:
  
  • Skin over distal thigh
  • Stifle

Question 17

Answer 17

N. femoralis

• Runs thorugh mm. psoas
• Runs with a. iliaca externa et v. iliaca communis
• Protected by m.sartorius et m. pectineus
• Innervates m. quadriceps femoris
• N. saphena branches off

Question 18

Answer 18

N. saphena

• Branch to m. sartorius
• Innervates skin:
  
  • From stifle → metatarsus (medially)

Question 19

Answer 19

N. obturatorius

• Medial aspect of ilium → for. obturatorum → mm. adductor

Question 20

Answer 20

Truncus lumbosacralis

• Leaves pelvis through greater sciatic foramen
• Branches to form:
  
  • N. gluteus cranialis
  • N. gluteus caudalis
  • N. ischiadicus

Question 21

Answer 21

N. ischiadicus

• From L₆-S₂
• Branches to form:
  
  • ​​Nn. fibularis
  • N. tibialis

Question 22

Answer 22

N. gluteus cranialis

• Located under the middle gluteal muscle

Question 23

Answer 23

N. gluteus caudalis

• Located under the superficial gluteal muscle