lower extremity - muscle compartments of the thigh Flashcards
How many muscles are in the anterior compartment of the thigh? name them
7 muscles
quadriceps femoris (4) - rectus femoris, vastus lateralis, vastic intermedius, vastis medialis)
sartorius
pectineus
iliopsoas
how would damage to the femoral nerve present (sensory and motor? what compartment is affected?
anterior compartment - flexion at hip, extension of knee
sensory - sensory loss at anterior thigh, medial leg
motor - decreased leg extension, patellar reflex
Iliopsoas (psoas major, iliacus) - action and innervation?
(AC)
A: flex thigh
I: L1-3 anterior rami (psoas), femoral n.
quadriceps femoris - what are the 4 muscles? action and innervation?
(AC)
rectus femoris, vastus lateralis, vastus intermedius, vastus medialis
A: knee extensors; RF flexes hip and extends knee
I: femoral n.
sartorius - action and innervation?
(AC)
A: flex, ABduct, lateral rotation of thigh; knee flexor*
I: femoral n.
pectineus - action and innervation?
(AC)
A: adduction (bc more medial), hip flexor
I: femoral n. (some obturator - transitional = sometime sconsidered medial compartment)
how many muscles are in the medial compartment of the thigh? name them
5 muscles
Adductors (3) - adductor longus, adductor brevis, adductor magnus)
obturator externus
gracilis
how would damage to the obturator nerve present (sensory and motor? what compartment is affected?
medial compartment
sensory: decreased sensation of medial thigh
motor: decreased adduction fxn
Adductor muscles (adductor longus, adductor brevis, adductor magnus) - action and innervation?
(MC)
A: ADduction of thigh
I: obturator n.
what important landmark is located in the adductor magnus? what happens here?
adductor hiatus - allows for passage of femoral vessels from anterior thigh to posterior, then into popliteal fossa (posterior knee)
what additional parts are included in adductor magnus
includes adductor and hamstring components
both adduct but both can also extend
hamstring portion = tibial n. innervation
Obturator externus - action and innervation?
(MC)
A: adduction of thigh; lateral rotation of thigh
I: obturator n.
Gracilis - action and innervation?
(MC)
*Most medial muscle of medial compartment
A: adduction of thigh; flexion of leg
I: obturator n.
what are the borders of the femoral triangle
mneumonic = SAIL
S: Sartorius
A: Adductor longus
IL: Inguinal Ligament
what neurovasculature is within the femoral triangle?
mneumonic = NAVEL
N: (femoral) Nerve
A: (femoral) Artery
V: (femoral) Vein
E: Empty space of canal
L: Lymphatics
Hamstrings (what 3 muscles?) - action and innervation?
(PC)
semimembranosus (most medial)
semitendinosus (longer, more distinct tendon)
biceps femoris (long head) (lateral)
A: flexion of knee, extension of thigh (think ‘donkey kick’); some minor medial/lateral rotation
I: tibial part of sciatic n.
*also note adductor magnus has hamstring component; aifs hip extension, tibial n. innerv.
what is the pes anserinus? what muscles attach?
pes anserinus = union point of all 3 compartments along the medial aspect of the leg
gracilis - MC
semitendinosus - PC
sartorius - AC
