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Anatomy > Foot Muscles and Arches > Flashcards

Foot Muscles and Arches Flashcards

1
Q

Extensor digitorum brevis IO Action Innervation

A

Origin:
* Superolateral surface of calcaneus

Insertion:
* Lateral sides of the tendons of extensor digitorum longus of digits #2-4

Action
* Extension of digits #2-4 at IP, MTP joints

Innervation:
Deep fibular nerve

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2
Q

Extensor hallucis brevis
IO Action Innervation

A

Often considered as the medial part of the extensor digitorum brevis muscle

Origin:
* Superolateral surface of calcaneus

Insertion:
* Base of proximal phalanx of great toe

Action
* Extension of digit #1 at MTP joint

Innervation
* Deep fibular nerve

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3
Q

Abductor hallucis IO Action Innervation

A

Origin:
* Medial side of the calcaneal tuberosity

Insertion:
* Medial side of base of proximal phalanx of the great toe

Action
* Adduction+Flexion of 1st digit at MTP joint
* Supports medial longitudinal arch of foot

Innervation
* Medial plantar nerve

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4
Q

Flexor digitorum brevis IO Action Innervation

A

Origin:
* Medial process of calcaneal tuberosity
* Plantar aponeurosis

Insertion:
* Sides of plantar surface of bases of middle phalanges of digits #2-5

Action
* Flexion of digits #2–5 at MTP,PIP joints

Innervation:
* Medial plantar nerve

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5
Q

Abductor digiti minimi IO Action Innervation

A

Origin:
* Lateral and medial processes of calcaneal tuberosity
* Plantar aponeurosis

Insertion:
* Lateral side of base of proximal phalanx of 5th digit

Action:
* Abduction of 5th digit at MPT joint

Innervation:
* Lateral plantar nerve

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6
Q

Lumbricals

A

Origin:
* Tendons of flexor digitorum longus

Insertion:
* Dorsal aponeurosis and medial side of the extensor expansion of digits (e.g. 1st lumbrical–>2nd digit)

Action:
* Flexion of digit at MTP
* Extension of digit at IP

Innervation:
Lumbrical #1:
* Medial plantar nerve
Lumbricals #2-4:
* Lateral plantar nerve

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7
Q

Quadratus plantae IO Action Innervation

A

Origin:
* Medial head: Medial surface of calcaneus
* Lateral head: Lateral process of calcaneal tuberosity; Long plantar ligament

Insertion:
* Lateral sides of tendon of flexor digitorum longus in proximal sole of the foot

Action
Assists flexor digitorum longus in:
* Flexion of digits #2–5 at MTP, IP joints

Innervation
* Lateral plantar nerve

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8
Q

Flexor hallucis brevis IO Action Innervation

A

Origin:
* Medial side of plantar surface of cuboid bone
* Plantar surface of lateral cuneiform
* Plantar calcaneocuboid ligament
* Tibialis posterior tendon

Insertion:
* Medial belly: Medial side of the proximal phalanx of digit #1
* Lateral belly: Lateral side of the proximal phalanx of digit #1

Action
* Flexion of digit #1 at MTP joint

Innervation
* Medial plantar nerve

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9
Q

Adductor hallucis IO Action Innervation

A

Origin:
* Oblique head: Bases of 2nd – 4th metatarsals; Sheath of fibularis longus tendon
* Transverse head: Plantar metatarsophalangeal ligaments of digits #3-5

Insertion:
* Lateral side of the base of the proximal phalanx of the great toe

Action
* Adduction of digit #1 at MTP joint
* Support longitudinal and transverse arches of the foot

Innervation
* Deep branch of lateral plantar nerve

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10
Q

Flexor digiti minimi brevis IO Action Innervation

A

Origin:
* Plantar aspect of base of the 5th metatarsal bone
* Sheath of fibularis longus tendon

Insertion:
* Base of the lateral side of the proximal phalanx of the 5th digit

Action
* Flexion of digit #5 at the MTP joint
* Supports lateral longitudinal arch of the foot

Innervation
* Superficial branch of lateral plantar nerve

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11
Q

Plantar interossei #1-3 IO Action Innervation

A

Origin:
* Base and medial border of 3rd, 4th and 5th
metatarsal bones

Insertion:
* Medial base of the proximal phalanges
* Extensor expansions of 3rd, 4th and 5th digits

Action:
* Adduction+Flexion of digit at MTP joint
* Extension of digit #3 at IP joints
(1st–>3rd digit and so on)

Innervation:
* Lateral plantar nerve

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12
Q

Dorsal interossei #1-4 IO Action Innervation

A

Origin:
* Adjacent sides of metatarsals 1-5

Insertion:
* 1st: medial base of the proximal pharlanx of
of 2nd digit
* 2nd-4th: lateral base of the proximal pharlanx of 2nd-4th digits

Action:
1st:
* Adduction + Flexion of 2nd digit at MTP joint
* Extension of digit #2 at IP joints

2nd-4th
* Abduction+Flexion of digit at MTP joint
* Extension of digit at IP joints
(2nd–>2nd digit and so on)

Innervation:
Lateral plantar nerve

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13
Q

1st layer of Sole

A

Abductor Hallicus
Flexor digitorum brevis
Abductor Digiti minimi

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14
Q

2nd layer of sole

A

Qaudratus Plantae
Lumbricals
Flexor digitorum longus tendons

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15
Q

3nd layer of sole

A

Adductor Hallucis
Flexor Hallucis Brevis
Flexor Digiti Minimi Brevis

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16
Q

4th layer of sole

A

Dorsal and Plantar Interossei

17
Q

Name the Foot arches

A

transverse arch:
Metatarsals 1-5, Cuneiform 1-3, Cuboid

lateral foot arch:
MT4-5, Cuboid & Calcaneus

medial foot arch:
MT1-3, Cuneiform 1-3, Navicular, Talus & Calcaneus

Anatomy (10 decks)

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