Leg Muscles - Ant

Question 1

What are they

Answer 1

dorsiflexors (extensors) of the foot + ankle OR toes

Question 2

List them

Answer 2

• Tibialis Ant
• EHL
• EDL
• Fibularis tertius

Question 3

Innervation

Answer 3

All by deep fibular n. but different branches

Question 4

Tibialis Ant.: Origin, Insertion, Innervation, Functions

Answer 4

Origin: lat. surface tibia + adj inteross
Insertion:mmed + inf surfaces med cuneiform & adj surfaces @ MT I bases
Innervation: Deep fibular n. L4, L5
Functions:
- dorsiflex foot @ ankle
- foot inversion
- dynamic support medial arch of foot

Question 5

EHL: Origin, Insertion, Innervation, Functions

Answer 5

Origin: middle 1/2 of med. fibula + adj. inteross
Insertion: dorsal base of hallux distal phalynx
Innervation: Deep fibular n. L5, S1
Functions:
- extend hallux
- dorsiflex foot

Question 6

EDL: Origin, Insertion, Innervation, Functions

Answer 6

Origin: prox 1/2 med. fibula + lat. tibial condyle
Insertion: dorsal digital expansions onto bases of 4 toes
Innervation: Deep fibular n. L5, S1
Functions:
- extend toes
- dorsiflex foot

Question 7

Fibularis tertius: Origin, Insertion, Innervation, Functions

Answer 7

Origin: distal med. fibula
Insertion: dorsomedial base MT V
Innervation: Deep fibular n. L5, S1
Functions: dorsiflex + evert foot

Question 8

Outlien briefly the course of the deep fibular n.

Answer 8

between fibulairs longus and neck of fibula –> descends between tibialis ant. & EHL @ inteross memberane, accompanied by ant. tibial a.

Question 9

Outline course of ant. tibial a.

Answer 9

• ant + sup to inteross memb;
• descends between tib. ant & EDL;
• toward med foot, under ER;
• becomes dorsalis pedis;