MSK Exam 1 Flashcards
What nerves make up the lumbar plexus?
L1-L4
What nerve root(s) innervate(s) the ilioinguinal nerve?
L1
What nerve root(s) innervate(s) the genitofemoral nerve?
L1 and L2
What nerve root(s) innervate(s) the lateral femoral cutaneous nerve?
L2 and L3
What nerve root(s) innervate(s) the femoral nerve?
L2, 3 and 4
What nerve root(s) innervate(s) the obturator nerve?
L2, 3, and 4
What nerve root(s) innervate(s) the lumbosacral trunk?
L4, L5.
What is the nerve distribution of the lateral cutaneous branch of the iliohypograstric nerve?
Lateral gluteal region
What is the nerve distribution of the ilioinguinal nerve?
Upper medial thigh
What is the nerve distribution of the genital branch of the genitofemoral nerve?
Upper medial thigh
What is the nerve distribution of the femoral branch of the genitofemoral nerve?
Upper anterior thigh
What is the nerve distribution of the lateral femoral cutaneous nerve?
Lateral and anterolateral thigh
What is the nerve distribution of the obturator nerve?
Medial thigh, just above the knee
What is the nerve distribution of the anterior cutaneous branches of the femoral nerve?
Anterior and anteromedial thigh
What is the nerve distribution of the saphenous branch of the femoral nerve?
Medial side of knee, leg, ankle
What nerve root(s) innervate(s) the sciatic nerve?
L4,L5,S1-3
What nerve root(s) innervate(s) the superior gluteal nerve?
L4,L5,S1
What nerve root(s) innervate(s) the nerve to the quadratus femoris?
L4,5,S1
What nerve root(s) innervate(s) the inferior gluteal nerve?
L5,S1,S2
What nerve root(s) innervate(s) the nerve to the obturator internus?
L5,S1,2
What nerve root(s) innervate(s) the nerve to piriformis?
S1, S2
What nerve root(s) innervate(s) the posterior cutaneous nerve of the thigh?
S1, S2, S3
What is the nerve distribution of the inferior cluneal nerves?
Lower buttock
What is the nerve distribution of the perineal branch of the posterior femoral cutaneous nerve?
Upper medial thigh
What is the nerve distribution of the posterior femoral cutaneous nerve?
Lower buttock, posterior thigh
What is the nerve distribution of the sural nerve?
Posterior leg, lateral side and the dorsum of the foot
What is the nerve distribution of the lateral sural cutaneous nerve?
Lateral side of the leg
What is the nerve distribution of the of the superficial fibular nerve?
Anterior lower leg & ankle, dorsum of the foot, adjacent sides toes 1-4
What dermatomes does the sacral plexus innervate?
Lower buttocks, posterior thigh and leg, lower anterior leg and foot.
What dermatomes does the lumbar plexus innervate?
The anterior and medial thigh, upper anterior leg, and medial leg
What innervates the upper buttocks?
Dorsal rami of lumbar and sacral nerves
Which dermatomes innervate the anterior region of the leg?
L1-L5
Which dermatomes innervate the posterior region of the leg?
S1-S2
Which dermatomes innervate the coccygeal region?
S3-S5
Where does the small saphenous vein originate?
Lateral side of the dorsal venous arch of the foot
Where does the small saphenous vein terminate?
In the popliteal vein between the heads of the gastrocnemius muscle
Where does the great saphenous vein originate?
From the dorsal venous arch of the foot
Where does the great saphenous vein terminate?
In the femoral vein in the saphenous opening
What causes varicose veins?
Which vein is often the culprit?
When the valves of superficial veins become incompetent.
The great saphenous vein and its tributaries often become varicose.
What does the primitively VENTRAL surface correspond to?
the FLEXOR side.
What does the primitively DORSAL surface correspond to?
the EXTENSOR side.
What causes compartment syndrome?
Swelling or bleeding into a compartment. The fascia will not stretch, and the increased pressure causes blood flow to the muscles/nerve cells to be disrupted. In acute compartment syndrome, a fasciotomy must be performed.
Which compartment of the thigh is the extensor compartment?
The ANTERIOR compartment.
Which compartment of the thigh is the flexor compartment?
The POSTERIOR compartment.
Which compartment of the thigh is the adductor compartment?
The MEDIAL compartment.
What supplies blood to a joint?
Arteries derived from the PERIARTICULAR ARTERIES of blood vessels.
How are joints innervated?
Joints are supplied by the nerves which innervate the muscles producing movement at that joint. (Hilton’s Law)
What are the movements allowed by synovial joints?
Gliding movements, angular motion, circumduction, and rotation.
What is the role of the acetabular labrum ligament of the hip joint?
Deepens the acetabulum
What is the role of the transverse acetabular ligament?
It crosses the notch to complete the rim of the acetabulum.
What is the role of the round ligament?
The round ligament is INTRACAPSULAR. It extends from the acetabular notch and transverse acetabular ligament to the FOVEA of the femur.
AKA the ligamentum capitus femoris
What is the role of the Iliofemoral ligament?
AKA the Y ligament of Bigelow.
Extends from the AIIS to the intertrochanteric line; prevents OVEREXTENSION.
What is the role of the pubofemoral ligament?
From the superior pubic ramus, joins the iliofemoral ligament, checks ABDUCTION.
What is the role of the ischiofemoral ligament?
Extends from the ischium behind the acetabulum to blend with the capsule, checks medial rotation
Which arteries serve as the PRINCIPAL blood supply to the head of the femur?
The medial and lateral circumflex arteries (both branches of the profunda femoris)
Which arteries contribute to the blood supply to the head of the femur that arise mainly from the medial circumflex artery?
Retinacular arteries (nutrient arteries), which pass along the femoral neck beneath the capsule.
Which artery provides VARIABLE (0-20%) blood supply to the head of the femur?
Artery of the ligament of the head of the femur; a branch of the obturator artery
Why is a fracture of the femoral neck a problem, and what condition does it often cause as a result?
The retinacular arteries originating from the medial circumflex artery are TORN leaving only the ligament of the femoral head as the sole source of blood supply, which is insufficient. Thus, ASEPTIC VASCULAR NECROSIS commonly results.
What is the action of the muscles of the anterior compartment of the thigh?
flexors of the hip joint and extensors of the knee joint
What innervates the muscles of the anterior compartment of the thigh?
The femoral nerve
What is the blood supply of the anterior compartment of the thigh?
The femoral artery
What is the proximal attachment of the pectineus muscle?
The superior ramus of the pubis
What is the distal attachment of the pectineus muscle?
Penctineal line of the femur (a ridge of the posterior surface of the shaft of the femur from the lesser trochanter)
What is the innervation of the pectineus?
Femoral nerve (L2, L3), sometimes obturator nerve
What is the action of the pectineus?
Adducts and flexes thigh; assists in medial rotation of the thigh
What 2 muscles make up the Iliopsoas?
The iliacus and the psoas major