Unit II Lec 18 Flashcards
Posterior abdominal wall is formed at the midline by what
five lumbar vertebrae and associated intervertebral discs
Posterior abdominal wall is formed laterally and superiorly by what
12th rib
Posterior abdominal wall is formed inferiorly by what
upper part of pelvis and 3-4mx
3 muscles line the posterior abdominal wall
psoas major, the iliacus and the quadratus lumborum
A loose, areolar connective tissue lines these muscles and the entire internal surface of the abdominal wall
endoabdominal or transversalis fascia
endoabdominal or transversalis fascia is continusous with what fascia
endopelvic fascia
Lumbar Plexus forms from what rami
anterior primary rami of L1 to L4, sometimes T12
Grar rami from what roots communicate with the lumbar plexus
all 5, T12-L4
White rami from what roots communicate with lumbar plexus
only 3, T12, L1, L2
Lumbar plexus form within what mx
psoas major
Psoas major emerges from what borders of the psoas major
lateral, anterior and medial borders
Letters of nerves from lumbar plexus from top to bottom
SIIGLFO
Nerve from T12
subcostal nerve
lumbar nerve to gluteal and hypogastric skin
iliohypogastric nerve (L1)
lumbar plexus nerve to skin of groin and scrotum/labia majorum
ilioinguinal nerve (L1
internal abdominal oblique mx is innervated by
ilioinguinal nerve (L1
transversus abdominis mx is innervated by
ilioinguinal nerve (L1
lumbar plexus n to to skin of mons pubis
genitofemoral nerve (L1-L2)
lumbar plexus n to labia majorum/scrotum
genitofemoral nerve (L1-L2)
lumbar plexus n to skin of the femoral triangle
genitofemoral nerve (L1-L2)
cremaster muscle is innervated by what lumbar plexus n
genitofemoral nerve (L1-L2)
lumbar plexus n to skin on anterolateral thigh
lateral femoral cutaneous nerve (L2-L3)
lumbar plexus n to anterior surface of thigh and medial aspect of leg and foot skin on the medial side of the leg
femoral nerve (L2-L4)
what branch of what lumbar plexus n innervates leg and foot
saphenous branch of femoral nerve (L2-L4
iliacus m is innervated by what lumbar plexus n
femoral nerve (L2-L4)
pectineus m is innervated by what lumbar plexus n
femoral nerve (L2-L4)
sartorius m is innervated by what lumbar plexus n
femoral nerve (L2-L4)
quadriceps femoris m is innervated by what lumbar plexus n
femoral nerve (L2-L4)
articular capsule of hip and knee joints is innervated by what lumbar plexus n
femoral nerve (L2-L4)
medial surfaces of thigh and articular capsule to hip and knee joints innervated by what lumbar plexus n
obturator nerve (L2-L4)
gracilis m is innervated by what lumbar plexus n
obturator nerve (L2-L4)
adductor brevis, longus and magnus m is innervated by what lumbar plexus n
obturator nerve (L2-L4)
obturator externus m is innervated by what lumbar plexus n
obturator nerve (L2-L4)
branch of obturator n that exists only in 9% of cases
accessory obturator nerve (L3-L4)
mx innervated by accessory obturator nerve only in 9% of cases
pectineus
Two divisions of lumbar plexus
posterior and anterior
Nerves in posterior lumbar plexus
lateral femoral cutaneous and femoral nerve
Nerves in anterior lumbar plexus
obturator and accessory nerves
The sacral plexus is formed by what rami and trunks
lumbosacral trunk, the ventral primary rami of the first, second, and third sacral nerves and part of the ventral primary ramus of the 4th sacral nerve
Sacral plexus is anterior to what mx
piriformis muscle
The sacral plexus is whereon the pelvic wall
on the posterior pelvic wall
Two divisions of sacral plexus
anterior and posterior
A number of branches from the sacral plexus pass to the lower limb through the _______ foramen
greater sciatic foramen
Letters of nerves from sacral plexus
SISNNPPNP
gluteus medius m is innervated by what n from sacral plexus
superior gluteal nerve (posterior division) (L4, L5, S1)
gluteus minimus m is innervated by what n from sacral plexus
superior gluteal nerve (posterior division) (L4, L5, S1)
tensor fasciae latae m is innervated by what n from sacral plexus
superior gluteal nerve (posterior division) (L4, L5, S1)
gluteus maximus m is innervated by what n from sacral plexus
inferior gluteal nerve (posterior division) (L5, S1, S2)
inferior gluteal nerve (posterior division) is from what 3 roots
(L5, S1, S2)
superior gluteal nerve (posterior division) is from what roots
(L4, L5, S1)
Sacral plexus n that is sensory to the skin on the lateral aspect of the skin and foot
sciatic nerve (post and anterior division) (L4 to S3)
sciatic nerve (post and anterior division) is from what roots
(L4 to S3)
sciatic nerve splits into what 2 nerves
tibial and the common peroneal nerves
Hamstring mx are innervated by what
Tibial nerve from sciatic nerve
muscles of the leg and foot are innervated by what
Tibial nerve from sciatic nerve
nerve to the quadratus femoris muscle and gemellus inferior (anterior division) is from what roots
(L4 - S1)
nerve to obturator internus and gemellus superior (anterior division) is from what roots
(L5 - S2).
n from sacral plexus that does sensory to the posterior thigh
posterior cutaneous nerves of the thigh
posterior cutaneous nerves of the thigh (mainly post division) is from what roots
(S2, S3)
sacral plexus n that does sensory to the lower half of the anal canal, perianal skin, and genitalia in both sexes
pudendal nerve (anterior division) (S2 - S4)
pudendal nerve (anterior division) is from what roots
(S2 - S4)
muscles of the perineum are innervated by what n from sacral plexus
pudendal nerve (anterior division) (S2 - S4
nerve to piriformis muscle (posterior division) are from what roots
(S1 - S2)
viscera is innervated by what n from sacral plexus
pelvic splanchnic nerves
n from sacral plexus that innervates the skin of the lower medial part of the buttocks
Inferior gluteal nerve
