Snell Dorsal Aspect of the Right Foot

Questions and Answers

What is the primary insertion point of the tibialis posterior tendon?

Tuberosity of the navicular (correct)

Tuberosity of the cuboid

Base of the first metatarsal

Tuberosity of the calcaneus

Which artery is considered the smaller terminal branch of the posterior tibial artery?

Medial plantar artery (correct)

Dorsalis pedis artery

Lateral plantar artery

Anterior tibial artery

What structure surrounds the tendon of tibialis posterior?

Synovial sheath (correct)

Ligamentous sheath

Tendon sheath

Bursa

Which muscle has both a transverse head and an oblique head?

Adductor hallucis Signup and view all the answers

What do small tendinous slips of the tibialis posterior tendon connect to?

The cuboid and cuneiforms Signup and view all the answers

What structure forms a blind tunnel in which the flexor tendons of the toe lie?

Fibrous flexor sheath Signup and view all the answers

Which tendon is NOT surrounded by a synovial sheath according to the provided information?

Tibialis anterior Signup and view all the answers

Which of the following statements about the fibularis longus tendon is incorrect?

It enters the foot from the medial malleolus. Signup and view all the answers

What provides support to the digital synovial sheaths found in the foot?

Fibrous flexor sheath Signup and view all the answers

Where does the fibularis longus tendon insert within the foot?

Base of the first metatarsal Signup and view all the answers

Which structure does the tendon of extensor digitorum longus pass deep to?

Superior extensor retinaculum Signup and view all the answers

What is the main action of the extensor digitorum brevis muscle?

Extends toes Signup and view all the answers

Which artery is NOT directly associated with the dorsum of the foot?

Blood supply from the plantar arch Signup and view all the answers

Which nerve provides the primary nerve supply to the dorsum of the foot?

Deep fibular (peroneal) nerve Signup and view all the answers

Which of these muscles does NOT have its insertion on the toes?

Fibularis brevis Signup and view all the answers

What is the origin of the extensor digitorum brevis muscle?

Inferior extensor retinaculum and calcaneum Signup and view all the answers

What anatomical feature deepens the acetabulum in the hip joint?

Acetabular labrum Signup and view all the answers

Which of the following statements about the deep fibular nerve is inaccurate?

It originates from the lumbar plexus. Signup and view all the answers

Which muscle is located in the first layer of the sole's muscles?

Abductor hallucis Signup and view all the answers

Which of the following muscles is part of the third layer of the sole's muscles?

Flexor digiti minimi brevis Signup and view all the answers

What condition may be caused by repeated minor trauma to the sole?

Calcaneal spur Signup and view all the answers

Which structure is primarily supported by the muscles of the sole?

Foot arches Signup and view all the answers

Which layer of the sole contains the long tendons from the leg compartments?

Second layer Signup and view all the answers

Which muscle in the second layer of plantar muscles is responsible for supporting the arches of the foot?

Quadratus plantae Signup and view all the answers

What is the primary function of the muscles in the sole of the foot?

Support of the arches Signup and view all the answers

Which tendon crosses the tendon of flexor hallucis longus in the foot?

Flexor digitorum longus Signup and view all the answers

Which muscle is NOT included in the third layer of the plantar muscles?

Tibialis posterior Signup and view all the answers

Where does the flexor digitorum longus tendon enter the sole?

Behind the medial malleolus Signup and view all the answers

Which of the following structures is part of the fourth layer of plantar muscles?

Intersossei Signup and view all the answers

What is the arrangement of flexor digitorum longus tendon in relation to flexor digitorum brevis?

It perforates it Signup and view all the answers

What role do the tendons from the posterior and lateral compartments of the leg play in the foot?

Insert into the sole Signup and view all the answers

Which nerve is primarily responsible for the sensory supply to the dorsum of the foot?

Superficial fibular (peroneal) nerve Signup and view all the answers

What is the main blood drainage structure of the foot on the medial side?

Great saphenous vein Signup and view all the answers

Which structure does the deep fibular nerve supply?

Adjacent sides of the big and second toes Signup and view all the answers

What is the primary function of the extensor digitorum brevis muscle?

Extension of the big toe Signup and view all the answers

What does the dorsal venous arch primarily collect from the toes?

Digital veins Signup and view all the answers

How does the extensor expansion function on the dorsum of the toes?

Divides into a central part and two lateral parts Signup and view all the answers

Which nerve supplies the skin along the lateral side of the little toe?

Sural nerve Signup and view all the answers

Where does the dorsal venous arch primarily lie?

In the subcutaneous tissue over the metatarsal bones Signup and view all the answers

What common feature characterizes the skin on the dorsum of the foot?

Thin, hairy, and mobile Signup and view all the answers

What is the primary function of the plantar aponeurosis?

To protect underlying nerves, blood vessels, and muscles Signup and view all the answers

Which of the following nerves innervates the lateral third of the sole?

Lateral plantar nerve Signup and view all the answers

Which muscle is NOT part of the first layer of the sole muscles?

Flexor digitorum longus Signup and view all the answers

What condition is characterized by pain and tenderness in the sole of the foot?

Plantar fasciitis Signup and view all the answers

The calcaneal spur is a result of ossification occurring in which part of the body?

Plantar aponeurosis Signup and view all the answers

How many slips does the base of the plantar aponeurosis divide into?

5 Signup and view all the answers

Which of the following structures does NOT provide innervation to the foot?

Popliteal nerve Signup and view all the answers

Which layer of the sole contains the flexor digitorum brevis?

First layer Signup and view all the answers

What is the primary action of the dorsal interossei muscles?

Abduction of toes Signup and view all the answers

Which nerves supply the plantar interossei muscles?

Lateral plantar nerve Signup and view all the answers

Where does the medial plantar nerve primarily run in relation to the abductor hallucis muscle?

Deep to the abductor hallucis Signup and view all the answers

Which of the following correctly describes the action of the plantar interossei muscles?

Adduction of toes Signup and view all the answers

What is the origin of the dorsal interossei muscles?

Adjacent sides of metatarsal bones Signup and view all the answers

How does the lateral plantar nerve diverge at the base of the fifth metatarsal bone?

Into superficial and deep branches Signup and view all the answers

What is the nerve root supply for the dorsal interossei muscles?

S2, 3 Signup and view all the answers

Which of the following statements about the medial plantar nerve is correct?

It provides muscular branches to several intrinsic muscles of the foot Signup and view all the answers

What do the plantar metatarsal arteries primarily supply?

Toes Signup and view all the answers

Which can be compared to the distribution of the lateral plantar nerve?

Ulnar nerve in the palm of the hand Signup and view all the answers

What is NOT a function of the medial plantar nerve?

Supplies flexor digiti minimi Signup and view all the answers

What vessel forms behind the medial malleolus from the medial and lateral plantar veins?

Posterior tibial venae comitantes Signup and view all the answers

What is the primary action of the tibialis posterior tendon?

Inversion of the foot Signup and view all the answers

Where do the plantar digital nerves branch from?

Both medial and lateral plantar nerves Signup and view all the answers

Study Notes

Dorsal Aspect of the Right Foot

Extensor hallucis brevis assists in big toe extension; lacks connection to the fifth digit.
Extensor digitorum longus tendon travels beneath the superior extensor retinaculum, part of the plantar arterial arch.
Deep fibular (peroneal) nerve penetrates the dorsum by passing deep to the extensor retinacula adjacent to the dorsalis pedis artery.

Key Arteries and Structures

Arteries: Anterior tibial artery, lateral tarsal artery, arcuate artery, dorsalis pedis artery, first dorsal metatarsal artery.
Retinacula: Superior and inferior extensor retinacula provide support and guide tendon paths.

Dorsum Muscle Details

Extensor digitorum brevis:
- Originates from the calcaneum and inferior extensor retinaculum.
- Inserts via four tendons into proximal phalanges and long extensor tendons of adjacent toes.
- Innervated by the deep fibular nerve (S1, S2).
- Functions to extend toes.

Joints and Their Connections

Major joints: Hip, knee, ankle; tarsal joints connect individual tarsal bones.
Acetabulum: Horseshoe-shaped articular surface, deepened by the acetabular labrum.

Muscles of the Sole

Divided into four layers:
- First Layer: Abductor hallucis, flexor digitorum brevis, abductor digiti minimi.
- Second Layer: Quadratus plantae, lumbricals, flexor tendon components.
- Third Layer: Flexor hallucis brevis, adductor hallucis, flexor digiti minimi brevis.
- Fourth Layer: Interossei, tendons of fibularis longus and tibialis posterior.

Nerve Supply and Venous Drainage

Medial Plantar Nerve: Branch of the tibial nerve; innervates surrounding muscles and provides cutaneous branches to medial three and half toes.
Lateral Plantar Nerve: Also a branch of the tibial nerve; supplies lateral sole and divides into superficial and deep branches.
Dorsal Venous Arch: Drains foot blood via digital and communicating veins, connecting to great and small saphenous veins.

Cutaneous Nerve Supply

Skin on the dorsum: Supplied mainly by superficial fibular nerve, with contributions from deep fibular, saphenous, and sural nerves.
Sensory distribution mirrors the vascular supply, with distinct areas for each nerve branch.

Tendons and Synovial Sheaths

Flexor Digitorum Longus Tendon: Enters the sole posteriorly, underlying the flexor retinaculum, inserting into the distal phalanges of toes.
Fibularis Longus Tendon: Runs from lateral malleolus across the sole to the medial cuneiform and first metatarsal base.

Plantar Fasciitis

Condition caused by prolonged standing or walking, leading to pain and possible ossification forming a calcaneal spur.

Plantar Aponeurosis

Thickening of deep fascia protecting underlying structures; spans from calcaneum to toe slips, assisting in foot stability.

Foot Functionality

The foot's arch structure supports body weight and enhances leverage for ambulation activities.

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Description

Explore the anatomy and key structures related to the dorsal aspect of the right foot in this quiz. Learn about the extensor muscles, various arteries, and the roles of the nerves in foot movement. Test your knowledge on the various tendons and joints involved.