nerves of abdomen Flashcards
1
Q
Where are the postganglionic SNS fibers located?
A
- walls of the organs (short)
2
Q
What type of nerves are the pelvic nerves?
A
- S2-4
- contribute formation pelvic plexus
- only splanchnic nerves carry PNS
3
Q
What structures does the pelvic nerves supply?
A
- descending colon
- sigmoid colon
- viscera in pelvis and perineum
4
Q
What comprises the hypogastric plexus?
A
- ascending fibers - PNS fibers
- descending fibers - SNS fibers
- fibers synapse and follow BV
5
Q
Lateral femoral cutaneous nerve
A
- L2-L3
- emerges from lateral side of psoas muscle
- runs from in front of iliacus and behind inguinal ligament
- innervates skin of anterior and lateral thigh
6
Q
Genitofemoral Nerve
A
- L1-L2
- emerges on the front of psoas muscle
- descends on anterior surface of psoas
- divides genital and femoral branch
7
Q
What does the genital branch of the genitofemoral nerve innervate?
A
- enters inguinal canal through deep inguinal ring to reach spermatic cord
- supplies cremaster muscle of scrotum
8
Q
What does the femoral branch of the genitofemoral nerve innervate?
A
- supplies the skin of the femoral triangle
9
Q
Obturator nerve
A
- L3-L4
- arises from 2nd, 3erd, 4th lumbar nerves
- descends along medial border of psoas muscle
- runs forward on lateral wall of pelvis and enters thigh through obturator foramen
- divides into anterior and posterior branches
10
Q
What do the anterior and posterior branches of obturator nerve innervate?
A
- innervates adductor group of muscles
- pectineus
- hip, knee joints
- skin on medial side of thigh
11
Q
Subcostal nerve
A
- T12
- runs behind lateral lumbocostal arch and in front of quadratus lumborum
- penetrates transverse abdominal muscle to run between it and internal oblique muscle
- innervates external oblique, internal oblique, transverse, rectus abdominis, pyramidalis muscles
