nerve supply

Question 1

What is the nerve supply of the peritoneum, ab muscles and lateral anterior aspects of the ab wall?

Answer 1

ventral rami T7 -T12 and L1 (iliohypogastric (ilioinguinal)spinal nerves

Question 2

What direction does the nerves pass?

Answer 2

inferior medial direction and gives off lateral cutaneous branch and proceed to the anterior where they provide cutaneous and motor innervation

Question 3

What is the course of T7 -T12?

Answer 3

leave intercostal spaces deep to the costal cartilage
goes anterolateral between the internal oblique & transverses abdominis (reaches lateral edge of rectus sheath)
enters rectus sheath pass behind rectus abdominis. gives off anterior cutaneous branch (passes through rectus abdomens and anterior rectus sheath to supply skin)
L1 branches follows similar path but with slight deviation

Question 4

What area of the skin does T7 to T9 supply?

Answer 4

xyphoid process to just above the umbilicus

Question 5

What area does What does spinal nerve 10 supply?

Answer 5

skin around umbilicus

Question 6

What area does T11 to L1 supply?

Answer 6

skin just below the umbilicus to pubic region

Question 7

What area does the L1 ilioinguanal nerve supply?

Answer 7

scrotum and labia majora and cutaneous branches to the thigh