Podcast
Questions and Answers
What is the primary function of the sternocleidomastoid muscle?
What is the primary function of the sternocleidomastoid muscle?
Which artery primarily supplies blood to the trapezius muscle?
Which artery primarily supplies blood to the trapezius muscle?
Which nerve is responsible for the innervation of the deltoid muscle?
Which nerve is responsible for the innervation of the deltoid muscle?
What is a key action of the pectoralis major muscle?
What is a key action of the pectoralis major muscle?
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Which muscle's origin is the first rib and its costal cartilage?
Which muscle's origin is the first rib and its costal cartilage?
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Study Notes
Clavicle Muscles: Origin, Blood Supply, Innervation, and Function
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Sternocleidomastoid:
- Origin: Manubrium of sternum and medial clavicle
- Blood Supply: Occipital artery, superior thyroid artery, external carotid artery branches
- Innervation: Accessory nerve (cranial nerve XI), cervical plexus branches
- Function: Flexes and rotates head, elevates sternum during forced inhalation
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Trapezius:
- Origin: Occipital bone, nuchal ligament, thoracic vertebrae spinous processes
- Blood Supply: Transverse cervical artery
- Innervation: Accessory nerve (cranial nerve XI), cervical plexus
- Function: Elevates, retracts, rotates scapula, extends neck
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Deltoid:
- Origin: Lateral clavicle third, acromion, scapula spine
- Blood Supply: Posterior circumflex humeral artery, deltoid branch of thoracoacromial artery
- Innervation: Axillary nerve
- Function: Abducts, flexes, and extends shoulder
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Pectoralis Major:
- Origin: Medial clavicle half (clavicular head), sternum and first six ribs (sternocostal head)
- Blood Supply: Pectoral branches of thoracoacromial artery
- Innervation: Lateral and medial pectoral nerves
- Function: Adducts and medially rotates arm, assists in shoulder flexion
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Subclavius:
- Origin: First rib and costal cartilage
- Blood Supply: Clavicular branch of thoracoacromial artery
- Innervation: Nerve to subclavius
- Function: Stabilizes clavicle during shoulder movements
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Description
Test your knowledge on the anatomy of clavicle muscles, including the sternocleidomastoid, trapezius, deltoid, and pectoralis major. This quiz covers their origins, blood supply, innervation, and functions, providing a comprehensive overview of these key muscle groups. Ideal for anatomy students and enthusiasts!
