Anterior Thigh & Leg and Dorsal Foot Flashcards
What muscles are found in the Anterior Compartment of the Thigh
- Quadriceps femoris
- Iliopsoas
- Sartorius
- Pectineus
Describe the Anterior Compartment Muscle Action rule
-Muscles Flex hip joint and extend knee joint
Describe the Anterior Compartment Muscle Innervation rule
Femoral n. (L2-L4) –> Emerges lateral to psoas major –> Passes deep to the inguinal ligament
- Innervates muscles in the anterior compartment of the thigh and skin on anteromedial thigh
- Terminal branch, the saphenous nerve, innervates skin on anteromedial aspect of knee, leg, and foot
What are the four muscles of the Quadriceps femoris
1) Rectus femoris
- Origin: anterior inferior iliac spine (AIIS)
- Action: flex hip joint and extend knee joint
2) Vastus lateralis
3) Vastus medialis
4) Vastus intermedius
- Origin: femur
- Action: extend knee joint
The 4 parts of the Quadriceps femoris unite distally to form the __________
quadriceps tendon
The quadriceps tendon continues as _________ and inserts on the ______________
- patellar ligament
- tibial tuberosity
Patella (large sesamoid bone) is embedded in _________
the quadriceps tendon
What is the function of the patella?
-Increases leverage of the quadriceps (increasing the power of knee extension)
What is Bursitis?
What can develop in the prepatellar bursa (between skin and patella) or suprapatellar bursa (deep to quadriceps tendon)
What does the Patellar tendon reflex test?
- Integrity of the femoral nerve and the L2-L4 spinal nerves.
- With knees flexed and relaxed, the patellar ligament is tapped to elicit rapid extension of the knee joint (the patellar reflex).
Describe the Iliopsoas and its exceptions to the “rules”
- Origin: iliac fossa (iliacus); lumbar vertebrae (psoas major)
- Insertion: lesser trochanter of femur
- Actions: flex hip joint (if LE is free); flex and stabilize the trunk (if LE is fixed)
Describe the Sartorius and its exceptions to the “rules”
- Origin: ASIS
- Insertion: medial aspect of proximal tibia
- Actions: flex, abduct, laterally rotate hip joint; flex knee joint (sit cross-legged)
Describe the Pectineus and its exceptions to the “rules”
- Origin: pubis
- Insertion: proximal femur
- Actions: weakly flex hip joint, adduct hip joint
- Innervation: femoral n. (similar to the rest of the compartment), but may receive a branch from obturator n.
What are the muscles in the Medial Compartment of the Thigh
- Adductor longus
- Adductor brevis (deep to adductor longus)
- Adductor magnus
- Gracilis
- Obturator externus
Describe the Medial Compartment Muscle Origin rule:
pubis
Describe the Medial Compartment Muscle Action rule:
adduct hip joint
Describe the Medial Compartment Muscle Innervation rule
Obturator nerve (L2-L4)
- Courses along lateral wall of pelvis and exits via obturator canal
- Innervates muscles of medial compartment of thigh; skin on medial thigh
Describe the Adductor magnus and its exceptions to the “rules”
-Adductor part (follows compartment rules for action/innervation)
- Hamstring part
- Origin: ischial tuberosity
- Insertion: adductor tubercle of femur
- Action: extend hip joint
- Innervation: tibial n. (of sciatic n.)
Describe the Gracilis and its exceptions to the “rules”
- Insertion: medial aspect of proximal tibia
- Actions: weakly adduct hip joint, flex/medially rotate knee joint
Describe the Obturator externus and its exceptions to the “rules”
- Origin: external aspect of obturator membrane, margin of obturator foramen
- Insertion: proximal femur
- Actions: laterally rotate and stabilize the hip joint
Describe the 3 fascial compartments in the leg
-Anterior, lateral, and posterior (superficial and deep layers)
What is compartment syndrome
Swelling within a compartment can compromise blood flow and/or innervation to tissues within that space
The crural fascia thickens distally to form the ____, _______ and __________
flexor, extensor, and fibular retinacula
What do the flexor, extensor, and fibular retinacula do?
hold tendons in place as they course into the foot