Podcast
Questions and Answers
What is the primary action of the Extensor digitorum?
What is the primary action of the Extensor digitorum?
- Flex toes
- Extend toes (correct)
- Rotate toes
- Adduct toes
To which structure do the tendons of the Extensor digits longus pass?
To which structure do the tendons of the Extensor digits longus pass?
- Medial four toes
- Big toe only
- All five toes
- Lateral four toes (correct)
Where does the Extensor digitorum originate?
Where does the Extensor digitorum originate?
- Tip of the tibia
- Superior surface of the fibula
- Lateral malleolus
- Anterior part of the upper surface of the Calcaneum (correct)
What is the insertion point of the Extensor digitalis and its brevis?
What is the insertion point of the Extensor digitalis and its brevis?
Which peripheral nerves are primarily involved with the Extensor digitorum?
Which peripheral nerves are primarily involved with the Extensor digitorum?
What action does the Peroneus Tertius muscle perform?
What action does the Peroneus Tertius muscle perform?
Which structure is a thickening of deep fascia that maintains the position of tendons around the ankle joint?
Which structure is a thickening of deep fascia that maintains the position of tendons around the ankle joint?
Which nerve supplies the Extensor Digitorum Longus muscle?
Which nerve supplies the Extensor Digitorum Longus muscle?
From which surface does the Tibialis Anterior muscle originate?
From which surface does the Tibialis Anterior muscle originate?
What is the primary action of the Peroneus Longus muscle?
What is the primary action of the Peroneus Longus muscle?
Which toes are associated with the tendons mentioned in the content?
Which toes are associated with the tendons mentioned in the content?
What is the role of the Extensor digitorum brevis in relation to the tendons?
What is the role of the Extensor digitorum brevis in relation to the tendons?
Where does the tendon join the Extensor digitorum brevis?
Where does the tendon join the Extensor digitorum brevis?
Which statement correctly describes the relationship between the tendons mentioned?
Which statement correctly describes the relationship between the tendons mentioned?
What anatomical feature do the mentioned tendons have in common?
What anatomical feature do the mentioned tendons have in common?
Why is the location of the tendon on the lateral side significant?
Why is the location of the tendon on the lateral side significant?
Which is a possible consequence of disruption in the tendons to the 2nd, 3rd, and 4th toes?
Which is a possible consequence of disruption in the tendons to the 2nd, 3rd, and 4th toes?
What structure receives the insertion of the Interossei and Lumbrical muscles?
What structure receives the insertion of the Interossei and Lumbrical muscles?
Which muscles insert into the Extensor Expansion?
Which muscles insert into the Extensor Expansion?
Where are the Interossei and Lumbrical muscles inserted?
Where are the Interossei and Lumbrical muscles inserted?
What are the lateral parts that are inserted into the structure mentioned in the content?
What are the lateral parts that are inserted into the structure mentioned in the content?
What is the primary function of the Lumbrical muscles?
What is the primary function of the Lumbrical muscles?
Which muscles are primarily responsible for finger abduction and adduction?
Which muscles are primarily responsible for finger abduction and adduction?
What does the term 'Distal ph.' refer to in this context?
What does the term 'Distal ph.' refer to in this context?
Flashcards
Extensor retinaculum
Extensor retinaculum
A thick band of connective tissue that holds the tendons around the ankle joint in place, preventing them from slipping out of position.
Superior Extensor Retinaculum
Superior Extensor Retinaculum
The superior extensor retinaculum is a band of connective tissue that attaches to the anterior borders of the tibia and fibula above the ankle joint.
Inferior Extensor Retinaculum
Inferior Extensor Retinaculum
The inferior extensor retinaculum is a Y-shaped band of connective tissue located inferior to the ankle joint, helping to hold the tendons in place.
What is the order of the muscles and structures in the anterior compartment of the leg from medial to lateral?
What is the order of the muscles and structures in the anterior compartment of the leg from medial to lateral?
Signup and view all the flashcards
What is the origin, insertion, action of the Peroneus Longus muscle?
What is the origin, insertion, action of the Peroneus Longus muscle?
Signup and view all the flashcards
Extensor Digitorum Brevis
Extensor Digitorum Brevis
Signup and view all the flashcards
Extensor Digitorum Longus
Extensor Digitorum Longus
Signup and view all the flashcards
Origin
Origin
Signup and view all the flashcards
Insertion
Insertion
Signup and view all the flashcards
Action
Action
Signup and view all the flashcards
Lateral Tendon Connection
Lateral Tendon Connection
Signup and view all the flashcards
Lateral Tendon Convergence
Lateral Tendon Convergence
Signup and view all the flashcards
Location of Extensor Muscles
Location of Extensor Muscles
Signup and view all the flashcards
Extensor Muscle Function
Extensor Muscle Function
Signup and view all the flashcards
Combined Extension
Combined Extension
Signup and view all the flashcards
What is the Extensor Expansion and what is its role?
What is the Extensor Expansion and what is its role?
Signup and view all the flashcards
What are interosseous muscles and their function?
What are interosseous muscles and their function?
Signup and view all the flashcards
What are lumbricals and their function?
What are lumbricals and their function?
Signup and view all the flashcards
What are the major structures that insert into the Extensor Expansion?
What are the major structures that insert into the Extensor Expansion?
Signup and view all the flashcards
How are the 2 lateral parts of the Extensor Expansion inserted?
How are the 2 lateral parts of the Extensor Expansion inserted?
Signup and view all the flashcards
What is the function of the extensor tendons?
What is the function of the extensor tendons?
Signup and view all the flashcards
Study Notes
Tibialis Anterior & Extensor Digitorum Longus
- Origin (Tibialis Anterior): Lateral surface of the tibia and interosseous membrane
- Insertion (Tibialis Anterior): Medial cuneiform and base of the 1st metatarsal
- Action (Tibialis Anterior): Extends foot at the ankle joint and inverts foot at the subtalar and transverse tarsal
- Origin (Extensor Digitorum Longus): Anterior surface of the fibula
- Insertion (Extensor Digitorum Longus): Extensor expansion of the lateral four toes
- Action (Extensor Digitorum Longus): Extends toes and dorsi flexes the foot at the ankle joint
Peroneus Tertius & Extensor Hallucis Longus
- Origin (Peroneus Tertius): Anterior surface of the fibula's shaft
- Insertion (Peroneus Tertius): Base of the 5th metatarsal bone
- Action (Peroneus Tertius): Dorsi flexes the foot at the ankle joint, everts at subtalar and transverse tarsal joints
- Origin (Extensor Hallucis Longus): Anterior surface of the fibula's shaft
- Insertion (Extensor Hallucis Longus): Base of the distal phalanx of the great toe
- Action (Extensor Hallucis Longus): Extends the big toe, dorsi flexes the foot at ankle joint, inverts at subtalar and transverse tarsal joints
Extensor Retinacula
- Function: Thickening of deep fascia; keeps tendons in position around the ankle joint
- Superior Extensor Retinaculum: Attached to the anterior borders of tibia and fibula, above the ankle
- Inferior Extensor Retinaculum: Y-shaped band inferior to the ankle
Structures Passing Deep to Extensor Retinacula
- Medial to Lateral: Tibialis anterior, extensor hallucis longus, vessels, nerve (dorsalis pedis), deep peroneal nerve, extensor digitorum longus (Mnemonic: TOM HAVEN NICE DOG)
Lateral Compartment of Leg
- Muscles: Peroneus longus, Peroneus brevis
- Nerve: Superficial peroneal
- Blood Supply: Peroneal artery
- Action: Plantar flexion and eversion
Peroneus Longus
- Origin: Lateral surface of the fibula's shaft
- Insertion: Base of the 1st metatarsal and medial cuneiform
- Action: Plantar flexes and everts foot at the ankle, subtalar, and transverse tarsal joints
Peroneus Brevis
- Origin: Lateral surface of the fibula's shaft
- Insertion: Base of the 5th metatarsal
- Action: Plantar flexes and everts the foot at the ankle, subtalar, and transverse tarsal joint
Dorsum of Foot
- Muscle: Extensor digitorum brevis
- Blood Vessel: Dorsalis pedis
- Nerve: Deep & Superficial peroneal
- Structure: Extensor muscles, retinacula, and nerves pass across the dorsum; tendons extend to the toes
Extensor Digitorum Brevis
- Origin: Upper anterior part of the calcaneus and inferior extensor retinaculum
- Insertion: Proximal phalanges of the toes 2-5
- Action: Extends the toes 2-5
Insertion of Long Extensor Tendons (Extensor Expansion)
- Tendons: Extensor digitorum longus pass to lateral four toes, joined by Extensor digitorum brevis tendons
- Fascial Expansion: Forms a fascial expansion on the dorsum of each toe; divides into 3 parts
- Central Part: Inserts into base of middle phalanx
- Lateral Parts: Inserts into base of distal phalanges
- Insertion of Structures: Receives insertion from interossei & lumbrical muscles
Synovial Sheaths of Extensor Tendons on the Dorsum of Foot
- Tibialis Anterior: Has its own synovial sheath
- Extensor Hallucis Longus: Has its own synovial sheath
- Extensor Digitorum Longus & Peroneus Tertius: Share a common sheath extending to the base of the 5th metatarsal
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Related Documents
Description
Test your knowledge on the anatomy and functions of key leg muscles such as the Tibialis Anterior, Extensor Digitorum Longus, Peroneus Tertius, and Extensor Hallucis Longus. This quiz will cover origins, insertions, and actions of these muscles. Perfect for anatomy students and enthusiasts alike!
