Nervous system lumbosacral plexus anatomy

label this segment

cervical intumescence (C6-T1)

label this segment

lumbar intumescence (L4-S3)

The medial branch of thoracic spinal nerves is

motor for epaxial muscles, sensory for the dorsum

What are the intercostobrachial nn.?

lateral cutaneous branches of IC nn. T2 and T3

innervate tricipital part and parts of axillary region of thoracic limb

name these branches of the spinal nerve from cranial to caudal

costoabdominal (T13), cranial iliohypogastric (L1), caudal iliohypogastric (L2)

label these two nerves that supply the abdominal wall cranial to caudal

ilioinguinal (L3), Lateral cutaneous femoral (L4)

What is the yellow arrowed nerve, what is its job?

genitofemoral nerve, motor to cremastor m, sensory from skin in inguinal region and proximal medial thigh

What nerve is pictured and what is its job?

obtrurator nerve, innervates ext ob, pectineus, gracillus, and adductor

What nerves are pictured here and their jobs

femoral nerve- motor for illiopsoas, quads, sartorius

Saphenous nerve- cutaneous innervation to skin of medial region of entire limb

label these arrows

sacrotuberus lig, caudal gluteal vessels, sciatic n

label these yellow arrows

cranial gluteal n, caudal gluteal n, sciatic n

What does the sciatic nerve innervate?

internal obtrurator, gemelli, quadratus femoris, biceps femoris, semimembranous, semitendinous

What does the sciatic nerve supply sensory information to?

cutaneous innervation to lateral and caudal surfaces of the crus

What does the common fibular nerve innervate?

flexors of tarsal joints and extensors of digits

What does the tibial nerve innervate?

extensors of the tarsal joint and flexors of the digits

label these arrows L-R top to bottom

sciatic nerve, common fibular nerve, motor branches of sciatic to BF SM and ST, tibial n

label these nerves L-R top to bottom

common fibular nerve, sciatic nerve, tibial nerve

The tibial nerve innervates

motor- gastrocnemius, superficial digital flexor, deep digi flexor, politeus

sensory- plantar surface of pes (medial and lateral plantar nerve)