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Questions and Answers
What is the main action of the acromial part of the deltoid muscle?
What is the main action of the acromial part of the deltoid muscle?
- Adducts the arm
- Extends and laterally rotates the arm
- Flexes and medially rotates the arm
- Abducts the arm (correct)
Which nerve innervates the deltoid muscle?
Which nerve innervates the deltoid muscle?
- Musculocutaneous nerve
- Axillary nerve (correct)
- Ulner nerve
- Radial nerve
Where does the deltoid muscle originate?
Where does the deltoid muscle originate?
- Medial border of the scapula
- Base of the skull
- Coracoid process of the scapula
- Lateral third of anterior clavicle, lateral acromion, and inferior edge of spine of the scapula (correct)
What is the primary blood supply to the deltoid muscle?
What is the primary blood supply to the deltoid muscle?
Which action is performed by the clavicular part of the deltoid muscle?
Which action is performed by the clavicular part of the deltoid muscle?
Flashcards
Deltoid Muscle
Deltoid Muscle
A muscle responsible for shoulder movement with three parts: clavicular, acromial, and spinal.
Deltoid Origin
Deltoid Origin
Originates from the lateral third of the clavicle, lateral acromion, and the spine of the scapula.
Deltoid Insertion
Deltoid Insertion
Inserts at the deltoid tuberosity of the humerus, allowing arm movement.
Deltoid Innervation
Deltoid Innervation
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Deltoid Action
Deltoid Action
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Study Notes
Deltoid Muscle
- Origin: Lateral one-third of the anterior clavicle, lateral acromion, and inferior scapular spine.
- Insertion: Deltoid tuberosity of the humerus.
- Innervation: Anterior and posterior branches of the axillary nerve (C5, C6).
- Action:
- Clavicular part: Flexes and medially rotates the arm.
- Acromial part: Abducts the arm (primary action).
- Spinal part: Extends and laterally rotates the arm.
- Blood Supply: Posterior circumflex humeral artery and deltoid branch of the thoracoacromial artery.
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