lab 8 ankle and foot

Question 1

Answer 1

soleus
Origin: Posterior aspect of the
head of the fibula and sup. ¼ of
the post. surface of the fibula
Soleal line and middle 1/3 of the
medial border of the tibia.
* Insertion: Post. Surface of the
calcaneus via the calcaneal
tendon.
* Innervation: Tibial Nerve
* Action: Plantar flexes the ankle,
regardless of knee position.

Question 2

Answer 2

tibialis anterior
Origin: Lateral Condyle and superior ½ of
the lateral surface of the tibia and
interosseous membrane
Insertion: Medial and inferior surfaces of
the medial cuneiform and base of the 1st
metatarsal
Innervation: Deep Fibular Nerve
Action: Dorsiflexes Ankle and inverts
foot.

Question 3

Answer 3

tibialis posterior
Origin: Interosseous membrane;
post. Surface of the tibia inf. To
soleal line; post. Surface of fibula.
* Insertion: Tuberosity of the
navicular, cuneiform cuboid and
calcaneus bases of 2nd, 3rd and 4th
metatarsals.
* Innervation: Tibial Nerve
* Action: Plantarflexes the foot, and
inverts the foot

Question 4

Answer 4

fibularis tertius
Origin: Inferior 1/3 of the
anterior surface of the fibula
and interosseous membrane
* Insertion: Dorsum of the
base of the 5th metatarsal
* Innervation: Deep Fibular
Nerve
* Action: Dorsiflexes ankle and
assists in eversion of the foot

Question 5

Answer 5

fibularis brevius
Origin: Inferior 2/3 of the
lateral surface of the fibula
* Insertion: Dorsal surface of
the tuberosity of the on the
lateral side of the base of
the 5th metatarsal
* Innervation: Superficial
Fibular Nerve
* Action: Everts Foot and
weakly plantarflexes the
ankle

Question 6

Answer 6

fibularis longus
Origin: Head and superior
2/3 of the lateral surface o f
the fibula
* Insertion: Base of the 1st
Metatarsal and Medial
Cuneiform
* Innervation: Superficial
Fibular Nerve
* Action: Everts Foot and
weakly plantarflexes the
ankle

Question 7

Answer 7

flexor digitiom longus
Origin: Medial part of the
posterior surface of the tibia
inf. To the soleal line.
* Insertion: Splits into 4 slips
which insert onto the base of
the distal phalanges of the
lateral 4 digits.
* Innervation: Tibial Nerve
* Action: Flexes toes, weakly PF
ankle, and supports
longitudinal arches of the foot

Question 8

Answer 8

flexor hallicus muscle
Origin: Inf. 2/3 of the post.
surface of the fibula
* Insertion: Base of the distal
phalanx of the great toe
* Innervation: Tibial Nerve
* Action: Flexes big toe, weakly
PF ankle, and supports medial
longitudinal arch of the foot

Question 9

Answer 9

extensor digitorm longus
Origin: Lateral condyle of the
tibia and superior ¾ of the
medial surface of the fibula
and the interosseous
membrane.
* Insertion: Middle and distal
phalanges of the lateral 4 digits
(Non-big toes).
* Innervation: Deep Fibular n.
* Action: Extends the Lateral 4
digits and dorsiflexes ankle
joint

Question 10

Answer 10

extensor hallicus longus
Origin: Middle part of the
anterior part of the fibula
and interosseous membrane.
* Insertion: Dorsal aspect of
the base of the distal
phalanx of the great toe
(Hallux).
* Innervation: Deep Fibular n.
* Action: Extends Great Toe
and Dorsiflexes ankle.

Question 11

Answer 11

Plantaris
Origin: Inf. End of the lateral
supracondylar line of the
femur, oblique popliteal lig.
* Insertion: Post. Surface of
the calcaneus via the
calcaneal tendon.
* Innervation: Tibial Nerve
* Action: Basically useless.