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Lab 8: Lower Limb
Muscles, Nerves and Movement
| Question | Answer |
|---|---|
| What are the 3 major nerves that supply the lower extremity? | femoral nerve, sciatic nerve, & obturator nerve |
| This nerve supplies the muscles of the anterior compartment of the thigh. | Femoral nerve |
| This nerve supplies the muscles of the medial (adductor) compartment of the thigh. | Obturator nerve |
| This is really 2 nerves that are bundled into 1 nerve in the thigh (tibial n. and common fibular n.). | Sciatic nerve |
| This nerve supplies the posterior compartment of the thigh, leg, & plantar surface of the foot. | Tibial nerve |
| This nerve supplies the anterior & lateral compartments of the leg and doral surface of the foot. | Common fibular nerve |
| As the external iliac artery passes into the thigh, it is renamed_______________. This is the main artery to the lower extremity. | femoral artery |
| This artery supplies anterior of the thigh. | Femoral artery |
| This branch of the femoral artery supplies the posterior compartment of the thigh. | deep artery of the thigh |
| As the femoral artery passes behind the knee it is renamed___________ and supplies around the knee. | popliteal artery |
| As the popliteal artery enters the leg, it branches into the________ and________. | anterior tibial and posterior tibial arteries. |
| The anterior tibial artery ends as the ________ of the foot. | dorsalis pedis artery |
| A branch of the posterior tibial artery that supplies the lateral compartmet of the lef. | fibular artery |
| The posterior tibial artery ends as the _________. | medial and lateral plantar arteries of the foot. |
| Innervaterd by Anterior rami of lumbar nn This muscle acts conjointly in flexing thigh at hip joint & in stabilizing this joint. | Iliopsoas |
| Innervated by Inferior gluteal n This muscle extends thigh & assists in its lateral rotation; steadies thigh & assists in rising from sitting position | Gluteus maximus |
| Innervated by Superior gluteal n Abducts & medially rotates thigh | Gluteus medius & Gluteus minimus |
| Innvervated by Femoral nerve This muscle flexes, abducts, & laterally rotates thigh at hip joint; flexes leg at knee joint | Sartorius |
| These muscles are innervated by the femoral nerve. They extend leg at knee joint; rectus femoris also steadies hip joint & helps iliopsoas flex thigh | Rectus femoris, Vastus medialis, Vastus intermedius, Vastus lateralis |
| These muscles are innervated by the sciatic nerve. They flex leg & rotate it laterally when knee is flexed; extends thigh | Biceps femoris |
| These nerves are innervated by the tibial division of the sciatic nerve. They extend thigh; flex leg & rotate it medially when knee is flexed | Semimembranous & Semitendinosus |
| Innervated by obturator nerve. Adducts thigh; flexes leg; helps rotate leg medially | Gracilis |
| Innervated by Obturator neve. Adducts thigh. | Adductor longus |
| Innervated by Obturator nerve & tibial part of sciatic nerve. Adducts thigh; flexes thigh & extends thigh | Adductor magnus |
| Innervated by obturator nerve. Adducts thigh; to some extent flexes it | Adductor brevis |
| Adducts & flexes thigh; assist w. medial rotation of thigh | Pectineus |
| Innervated by deep fibular nerve. Dorsiflexes ankle & inverts foot. | Tibialis anterior |
| Innervated by deep fibular nerve. Extends lateral 4 digits & dorsiflexes ankle | Extensor digitorum longus |
| Innervated by deep fibular nerve. Extends great toe & dorsiflexes ankle | Extensor hallucis longus |
| Innervated by Superficial fibular nerve. These muscles of the lateral leg everts foot & weakly plantarflexes ankle. | Fibularis longus & Fibularis brevis |
| Innervated by Tibial nerve. Plantarflexes ankle when knee is extended; raises heel during walking; flexes leg at knee joing | Gastrocnemius |
| Innervated by Tibial nerve. Plantarflexes ankle independently of knee position; steadies leg on foot | Soleus |
| Innervated by Tibial nerve. Weakly flexes knee & unlocks it; medially rotates ribia of unplanted limb | Popliteus |
| Innervated by Tibial nerve. Flexes great toe | Flexor hallucis longus |
| Innervated by Tibial nerve. Flexes lateral four digits; plantarflexes ankle | Flexor digitorum longus |
| Plantarflexes ankle; inverts foot | Tibialis posterior |
| Innervated by deep fibular nerve. Aides the extensor digitorum longus in extending the 4 medial toes | Extensor hallucis brevis |
| Innervated by deep fibular nerve. Aidses the extensor hallucis longus in extending the great toe | Extensor digitorum brevis |
| Innervated by medial plantar nerve. Abducts & flexes 1st digit (great toe, hallux) | Abductor hallucis |
| Innervated by medial plantar nerve. Flexes lateral 4 digits. | Flexor digitorum brevis |
| Innervated by Lateral plantar nerve. Abducts & flexes little toe (5th digit) | Abductor digiti minimi |
| Innervated by Lateral plantar nerve. Assists flexor digitorum longus in flexing lateral 4 digits | Quadratus plantae |
| Innervated by medial plantar nerve. Flexes proximal phalanx of 1st digit. | Flexor hallucis brevis |
| Innervated by lateral plantar nerve. Adducts 1st digit | Adductor hallucis |
| Innervated by lateral plantar nerve. Flexes proximal phalanx of 5th digit, thereby assisting w. its flexion | Flexor digiti minimi brevis |
| Innervated by lateral plantar nerve. Adducts digits (3-5) & flex metatarsophalangeal joints | Plantar interossei |
| Abduct digits (2-4) & flex metatarsophalangeal joints | Dorsal interossei |
| What is the function of the anterior cruciate ligament (ACL)? | It prevents posterior displacement of the femur on the tibia & hyperextenstion of the knee joint. |
| What is the function of the posterior cruciate ligament (PCL)? | It prevents the anteriior displacement of the tibia on the femur & helps prevent hyperflexion of the knee joint. It is the main stabilizing factor for the femur. |
Created by:
arieal1
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