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Intrinsic Muscles Of The Foot Flashcards

1
Q

What nerve innervates both muscles on the dorsal aspect of the foot?

A

Deep fibular nerve

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2
Q

What is the origin of EDB?

A

Calcaneus and inferior extensor retinaculum

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3
Q

What is the insertion of EDB?

A

Long extensor tendons of the lateral 4 toes

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4
Q

What are the actions of EDB?

A

Extends the lateral 4 toes at MTP and IP joints

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5
Q

What is the nerve supply to EDB?

A

Deep fibular nerve

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6
Q

What is the origin of EHB?

A

Calcaneus and inferior extensor retinaculum

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7
Q

What is the insertion of EHB?

A

Proximal phalanx of great toe

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8
Q

What is the action of EHB?

A

Extends great toe at MTP joint

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9
Q

What is the nerve supply to EHB?

A

Deep fibular nerve

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10
Q

How many layers is the plantar aspect of the foot split into?

A

4 layers

1st layer is the most superficial to sole

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11
Q

How many intrinsic muscles of the foot are on the dorsal aspect and what are they ?

A

2
Extensor digitorum brevis
Extensor hallucis brevis

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12
Q

What is the origin of the abductor hallucis?

A

Medial tubercle of calcaneus and flexor retinaculum

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13
Q

What is the insertion of abductor hallucis?

A

Proximal phalanx of great toe

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14
Q

What are the actions of abductor hallucis?

A

Abduction and flexion of great toe

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15
Q

What is the nerve supply to abductor hallucis?

A

Medial plantar nerve

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16
Q

What is the origin of the flexor digitorum brevis?

A

Medial tubercle of calcaneus and plantar aponeurosis

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17
Q

Where does the FDB insert?

A

Middle phalanges of lateral 4 toes

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18
Q

What is the action of FDB?

A

Flexes lateral 4 digits at proximal IP joints

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19
Q

What is the nerve supply to FDB?

A

Medial plantar nerve

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20
Q

What is the origin of abductor digiti minimi?

A

Medial and lateral tubercles of calcaneus

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21
Q

What is the insertion of AbDM?

A

Proximal phalanx of 5th digit

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22
Q

What are the actions of AbDM?

A

Abducts and flexes 5th digit

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23
Q

What is the nerve supply to AbDM?

A

Lateral plantar nerve

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24
Q

How many types of muscles are in the second layer of the plantar aspect and what are they?

A

2

Quadratus plantar and lumbricals

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25
Name the 3 muscles of the 1st layer of the plantar aspect
Abductor hallucis Flexor digitorum brevis Abductor digit minimi
26
What is the origin of the quadratus plantae?
Plantar surface of calcaneus
27
Where does the QP insert?
Tendons of FDL
28
What is the action of QP?
Flexing lateral 4 digits
29
What is the nerve supply to QP?
Lateral plantar nerve
30
How many lumbricals do we have in each foot?
4
31
What is the origin of the lumbricals?
Tendons of FDL
32
What is the insertion of the lumbricals?
Extensor hoods of lateral 4 digits
33
What are the actions of the lumbricals?
Flexing MTP joints | Extending IP joints
34
What is the nerve supply to the lumbricals?
Most medial = medial plantar nerve | 3 lateral lumbricals = lateral plantar nerve
35
How many muscles are in the 3rd layer of the plantar aspect and what are they?
3 Flexor hallucis brevis Adductor hallucis Flexor digiti minimi brevis
36
What is the origin of FHB?
Cuboid and lateral cuneiform
37
What is the insertion of FHB?
Proximal phalanx of great toe
38
What is the action of FHB?
Flex MTP joint of great toe
39
What is the nerve supply to FHB?
Medial plantar nerve
40
What is the origin of adductor hallucis?
Oblique head = base of first 4 metatarsals | Transverse head = plantar ligaments of MTP joints
41
What is the insertion of AdH?
Proximal phalanx of great toe
42
What are the actions of adductor hallucis?
Adducts great toe | Forms transverse arch of foot
43
What is the nerve supply to AdH?
Deep branch of lateral plantar nerve
44
What is the origin of FDMB?
Base of 5th metatarsal
45
What is the insertion of FDMB?
Proximal phalanx of 5th digit
46
What is the action of FDMB?
Flexes 5th digit
47
What is the nerve supply to FDMB?
Superficial branch of lateral plantar nerve
48
What muscles make up the fourth (deepest) layer of the plantar aspect?
Plantar interossei | Dorsal interossei
49
How many plantar interossei do we have per foot?
3
50
How many dorsal interossei do we have per foot?
4
51
What is the origin of the plantar interossei?
Medial sides of metatarsals 3-5
52
What is the insertion of plantar interossei?
Medial sides of phalanges of digits 3-5
53
What are the actions of the plantar interossei?
Adduct digits 3-5 | Flex MTP joints
54
What is the nerve supply to plantar interossei?
Lateral plantar nerve
55
How do the dorsal interossei attach?
Each muscle arises from 2 metatarsals 1st muscle attaches to medial side of 2nd digit (proximal phalanx) 2nd-4th muscles attach to lateral sides of digits 2-4
56
What are the actions of dorsal interossei?
Abduct digits 2-4 | Flex MTP joints
57
What is the nerve supply to dorsal interossei?
Lateral plantar nerve
58
Contusion of EDB results in ...
Haematoma | Swelling anteromedial to lateral malleolus
59
When might medial plantar nerve entrapment occur?
During repeated eversion of the foot (eg. Gymnastics)
60
What are the symptoms of medial plantar nerve entrapment?
Aching Numbness Paraesthesia of medial side of sole
61
Describe the dorsalis pedis pulse
From dorsalis pedis artery on dorsum of foot, just lateral to EHL tendon Artery supplies tarsal bones and dorsal aspect of metatarsals (Contributes to toes via deep plantar arch)
62
Where do the great and small saphenous veins start?
Dorsal venous arch of the foot

Musculoskeletal System (26 decks)

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