Lower Extremity Muscles: Action Flashcards
These 2 muscles flexes thigh on trunk. However, if thigh is fixed, it flexes the trunk on the thigh as in sitting up
from lying down
Iliacus and Psoas
The following acts as a lateral rotator of thigh at hip joint, EXCEPT:
A. Quadratus femoris
B. Gemellus Superior
C. Gemellus Inferior
D. Obturator Internus
E. None
E. None
These 2 hip muscles abducts thigh at hip joint and tilts pelvis when walking to permit opposite leg to clear ground
Gluteus Minimus and Gluteus Medius
Match the following actions to its corresponding muscle.
- Flexes and adducts thigh at hip joint
- Lateral rotator of thigh at hip joint
- Assists gluteus maximus in extending
the knee joint
A. Tensor fascia latae
B. Pectineus
C. Piriformis
- B
- C
- A
These 2 muscles adducts thigh at hip joint and assists in lateral rotation. Which muscles are they?
Adductor Longus and Adductor Brevis
Match the following actions to its corresponding muscle.
- Semitendinosus
- Gracilis
- Obturator Externus
- Semimembranosus
- Vastus Medialis
A. Laterally rotates thigh at hip joint
B. Adducts thigh at hip joint; flexes leg at
knee joint
C. Flexes and medially rotates leg at knee
joint; extends thigh at hip joint
D. Extension of leg at knee joint; stabilizes
patella
E. Extension of leg at knee joint;
articularis genus retracts synovial membrane
- C
- B
- A
- C
- D
The action of the Rectus Femoris is (1)_____ of leg at knee joint (2)_____ of thigh at hip joint
- Extension
- Flexion
TRUE OR FALSE: Sartorius flexes, abducts, medially rotates thigh at hip joint. It also flexes and laterally rotates leg at knee joint.
False.
It performs ER on hip and IR on knee.
The biceps femoris (1)_____ and laterally rotates leg at knee joint. In addition, its long head also (2)____ thigh at hip joint
- flexes
- extends
TRUE OR FALSE: The hamstring portion of the adductor magnus extends thigh at hip joint
True
This muscle is responsible for extension of leg at knee joint and its articularis genus retracts synovial membrane
Vastus Intermedius
TRUE OR FALSE: Vastus Lateralis extends leg at knee joint
True
Gluteus Maximus (1)____ and (2)____ hip joint; through
iliotibial tract, it (3)____ knee joint
- extends
- laterally rotates
- extends
TRUE OR FALSE: Adductor magnus adducts thigh at hip joint and assists in lateral rotation.
True
This muscle extends the toes.
Extensor digitorum brevis
These 2 muscles is responsible for the abduction of toes, flexion of MTP joints and extension of IP joints.
Dorsal and Plantar interossei
Determine the action of the following muscles.
- braces medial longitudinal arch
- braces lateral longitudinal arch
- braces medial and lateral longitudinal arches
A. Abductor hallucis
B. Flexor digitorum brevis
C. Abductor digiti minimi
D. All
E. None
- A
- C
- B
The following are functions of the tibialis posterior, EXCEPT:
A. inverts foot at subtalar joint
B. inverts foot at transverse tarsal joint
C. everts foot at transverse tarsal joint
D. supports medial longitudinal arch of foot
E. plantarflexes foot at ankle joint
C. everts foot at transverse tarsal joint
This muscle is a knee flexor, but also unlocks knee joint by lateral rotation of femur on tibia and slackens
ligaments of joint.
Popliteus
This muscle provides main propulsive force in walking and running
Soleus
TRUE OR FALSE: Both the Gastrocnemius and the Plantaris muscle flexes knee joint and plantar flexes foot at ankle joint
True
The function of the peroneus longus and peroneus brevis are the following:
(1)_____ of foot at ankle joint, (2)____ of foot at subtalar and transverse tarsal joint and supports (3)______ longitudinal arch of foot
- plantarflexion
- eversion
- lateral
What are the actions of extensor digitorum longus?
- Extends toes
- Extends foot at ankle joint
Determine which muscle is being described by its action.
- Extends foot at ankle joint; everts foot at subtalar and transverse tarsal joints
- Assists flexor digitorum longus in flexing lateral four toes
- Extends foot at ankle joint; inverts foot at subtalar and transverse tarsal joints; holds up medial longitudinal arch of foot
A. Quadratus Plantae
B. Peroneus tertius
C. Flexor digitorum longus
D. Tibialis anterior
E. Flexor hallucis longus
- B
- A
- D
Together with gastrocnemius and plantaris, This muscle is a powerful plantar flexor of ankle joint
Soleus
Determine which muscle is being described by its action.
- Flexes distal phalanx of big toe; plantar flexes foot at ankle joint; supports medial longitudinal arch of foot
- Extends big toe; extends foot at ankle joint;
inverts foot at subtalar and transverse tarsal joints - Extends toes at interphalangeal joints
- Flexes metatarsophalangeal joint of big toe; holds together metatarsal bones
- Flexes distal phalanges of lateral four toes;
plantar flexes foot at ankle joint; supports medial and lateral longitudinal arches of foot
A. Extensor hallucis longus
B. Lumbricals
C. Flexor digitorum longus
D. Flexor hallucis brevis
E. Flexor hallucis longus
- E
- A
- B
- D
- C
Determine the action of Flexor digiti minimi brevis
A. Assists flexor digitorum longus in flexing lateral
four toes
B. Flexes and abducts fifth toe; braces lateral
longitudinal arch
C. Flexes metatarsophalangeal joint of little toe
D. Flexes metatarsophalangeal joint of big toe;
holds together metatarsal bones
E. Flexes metatarsophalangeal joint of big toe;
supports medial longitudinal arch
C. Flexes metatarsophalangeal joint of little toe
This muscle flexes metatarsophalangeal joint of big toe; supports medial longitudinal arch.
A. Flexor hallucis brevis
B. Adductor hallucis
C. Lumbricals
B. Adductor hallucis
