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Questions and Answers
What is the shape of the spine or spinous process of the scapula?
What is the shape of the spine or spinous process of the scapula?
What is the function of the inferior angle of the scapula?
What is the function of the inferior angle of the scapula?
Which muscle arises from the medial two-thirds of the subscapular fossa?
Which muscle arises from the medial two-thirds of the subscapular fossa?
What is the direction of the glenoid cavity or fossa?
What is the direction of the glenoid cavity or fossa?
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Which process has a facet for the clavicle?
Which process has a facet for the clavicle?
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Which muscle arises from the lower border of the crest of the spine and from the lateral border of the acromion?
Which muscle arises from the lower border of the crest of the spine and from the lateral border of the acromion?
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What is the shape of the coracoid process?
What is the shape of the coracoid process?
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Which muscle is inserted into the upper border of the crest of the spine and into the medial border of the acromion process?
Which muscle is inserted into the upper border of the crest of the spine and into the medial border of the acromion process?
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Study Notes
Scapula Characteristics
- The lateral border of the scapula is thick and features the scapular tubercle at the upper end.
- The medial border is thin and extends from the superior angle to the inferior angle.
Angles of the Scapula
- The superior angle is covered by the trapezius muscle.
- The inferior angle is covered by the latissimus dorsi muscle and moves forward around the chest when the arm is abducted.
- The lateral or glenoid angle is broad and features the glenoid cavity or fossa, directed forwards, laterally, and slightly upwards.
Processes of the Scapula
- The spine or spinous process is a triangular plate of bone with three borders and two surfaces, dividing the dorsal surface of the scapula into the supraspinous and infraspinous fossae.
- The acromion process has two borders (medial and lateral), two surfaces (superior and inferior), and a facet for the clavicle.
- The coracoid process is directed forwards and slightly laterally, bent, and finger-like, and is an atavistic type of epiphysis.
Muscle Attachments
- The subscapularis muscle arises from the medial two-thirds of the subscapular fossa.
- The supraspinatus muscle arises from the medial two-thirds of the supraspinous fossa, including the upper surface of the spine.
- The infraspinatus muscle arises from the medial two-thirds of the infraspinous fossa, including the lower surface of the spine.
- The deltoid muscle arises from the lower border of the crest of the spine and from the lateral border of the acromion.
- The trapezius muscle is inserted into the upper border of the crest of the spine and into the medial border of the acromion process.
- The serratus anterior muscle is inserted along the medial border of the costal surface in three parts: one digitation from the superior angle to the root of the spine, two digitations to the medial border, and five digitations to the inferior angle.
- The long head of the biceps brachii arises from the supraglenoid tubercle, and the short head from the lateral part of the tip of the coracoid process.
- The coracobrachialis muscle arises from the medial part of the tip of the coracoid process.
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Description
This quiz covers the structure and features of the scapula bone, including its borders, angles, and cavities. It's essential for anatomy students to learn about the scapula's anatomy.
