1 myology myology of the foot. 2 intrinsic muscle of the foot: overview dorsum of foot: 1. extensor...
TRANSCRIPT
1
Myology
Myology of the
Foot
2
Intrinsic Muscle of the Foot: OverviewDorsum of foot:
1. Extensor Digitorum Brevis: Extends toes 1 through 4
Plantar Surface:Layer 1 (Superficial): All originate on the calcaneus and insert into the toes
1. Abductor Hallucis: Abducts and flexes the great toe2. Flexor Digitorum Brevis: Flexes MP’s and PIP’s of the four lateral toes3. Abductor Digiti Minimi: Abducts and Flexes the 5th toe
Layer 2:1. Lumbricales: Same action as the hand2. Quadratus Plantae: Originates on the calcaneus and inserts the tendons of the flexor
digitorum longus. As a result it assists in the flexion of the four lateral toesLayer 3:
1. Flexor Hallucis Brevis: Flexes the great toe at the MP2. Adductor Hallucis: Adducts and flexes the great toe3. Flexor Digiti Minimi Brevis: Flexes the 5th toe at the MP
Layer 4: (Deepest)1. Dorsal Interossei: DAB and assists the lumbricals2. Plantar Interossei: PAD and assists the lumbricals
3
Extensor Digitorum BrevisExtensor Hallucis Brevis
O: Dorsal surface of calcaneus
I: Top of toes 1 – 4
A: Extends toes 1-4
N: Deep peroneal nerve
4
Plantar Surface of the Foot Layer 1
Abductor Hallucis Longus
Flexor Digitorum Brevis
Abductor Digiti Minimi
5
Abductor Hallucis
O: Calcaneus
I: Medial side of great toe
A: Abducts great toe
N: Medial plantar nerve (branch
of tibial nerve)
6
Flexor Digitorum Brevis
O: Calcaneus
I: Plantar surface of middle 3
phalanges of toes 2 - 5
A: Flexes toes at MP and PIP
joints
N: Medial plantar nerve (branch
of tibial nerve)
7
Abductor Digiti Minimi
O: Calcaneus
I: Lateral side of the 5th toe
A: Abducts the 5th toe
N: Lateral plantar nerve (branch
of tibial nerve)
8
Plantar Surface of the Foot Layer 2
Lumbricales
Quadratus Plantae
9
Lumbricales
O: Tendons of the Flexor Digitorum
Longus
I: Tendons of the Extensor Digitorum
Longus
A: Flexes the MP’s and Extends the
DIP’s and PIP’s
N: Medial and Lateral plantar nerves
10
Quadratus Plantae
O: Calcaneus
I: Tendons of the Flexor Digitorum
Longus
A: Flexes toes 2 – 5 at the MP, PIP,
and DIP joints
N: Lateral plantar nerve (branch
of tibial nerve)
11
Plantar Surface of the Foot Layer 3
Flexor Hallucis Brevis
Adductor Hallucis
Flexor Digiti Minimi Brevis
12
Flexor Hallucis Brevis
O: Tarsals (Cuboid and 3rd Cuneiform)
I: Base of the proximal phalange of the
great toe
A: Flexes the great toe at the MP joint
N: Medial plantar nerve
13
Adductor Hallucis
O:
Oblique Head: tendon of the peroneus
longus and bases of 2 – 4th metatarsals.
Transverse Head: Plantar metatarso-
phalangeal ligaments
I: Lateral side of the base of the proximal phalange of the great toe
A: Adducts the great toe
N: Lateral plantar nerve
14
Flexor Digiti Minimi Brevis
O: tendon of the peroneus longus and
the base of the 5th metatarsal.
I: Base of the proximal phalange of the
5th toe
A: Flexes the little toe at the MP joint
N: Lateral plantar nerve
15
Plantar Surface of the Foot Layer 4
Dorsal Interossei
Plantar Interossei
16
Dorsal Interossei
O: Each one arises from the adjacent
sides of two metatarsals.
I: Sides of the phalanges and the distal
tendons of the Extensor digitorum
longus.
A: Abducts the toes (DAB)
N: Lateral plantar nerve
17
Plantar Interossei
O: Medial side of 3 – 5th metatarsals.
I: Sides of the phalanges and the
distal tendons of the Extensor
digitorum longus.
A: Adducts the toes (PAD)
N: Lateral plantar nerve