Revision for written test: Lumbar plexus

Question 1

N. Iliohypogastricus:
1. What happens in species with 7 lumbar vertebrae?
2. Supplies what?
3. Divides into what?

Answer 1

1. Then it is called n. iliohypogastricus cranialis et caudalis
2. Abdominal muscles & skin (m. transversus abdominis + obliquus internus)
3. Ramus cutaneus medialis et lateralis

Question 2

N. Ilioinguinalis
1. Supplies what?
2. Divided into what?

Answer 2

1. Skin & muscles of abdomen (m. transversus abdominis + obliquus internus)
2. Ramus cutaneus medialis et lateralis

Question 3

N. Genitofemoralis
1. What direction does it run? How would you “describe” the location
2. Supplies what?
3.Divides into what?
4. What role do the sympathetic fibres play?

Answer 3

1. Goes through inguinal canal
2. Mammary gland, skin surrounding vulva, prepuce and scrotum
3. Ramus femoralis et Ramus
   genitalis
   >Genital branch goes
   through inguinal canal
   w/ a. pudenda externa
4. Regulate milk flow

Question 4

N. Cutaneus femoris lateralis
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 4

1. Passes proximally w/ a. circumflexa ilium profunda
2. Supplies skin over distal thigh and stifle joint

Question 5

N. Femoralis
1. What direction does it run? How would you “describe” the location
2. Supplies what?
3. Branches?

Answer 5

1. From L3-L6, next to pecten ossis pubis
2. Iliopsoas, sartorius, quadriceps, pectineus m, and skin on medial surface
3. N. saphenous
   >Medial muscles & skin
   on medial aspect of crus,
   tarsus + metatarsus

Question 6

N. Obturatorius
1. What direction does it run? How would you “describe” the location
2. Supplies what?

Answer 6

1. From L4-S1, Enters foramen obturatorium next to corpus ilium
2. Supplies adductor, pectineus, gracilis & obturator muscles