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Questions and Answers
Which muscle acts as a lever for the action of the serratus anterior in overhead abduction of the arm?
Which part of the scapula gives attachment to the spine of the scapula and divides the surface into supraspinous and infraspinous fossae?
Where is the infraglenoid tubercle located on the scapula?
What structure is covered by the latissimus dorsi muscle on the scapula?
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Where is the suprascapular notch located on the scapula?
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Which muscle covers the superior angle of the scapula?
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What divides the dorsal surface of the scapula into the supraspinous and infraspinous fossae?
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Which muscle arises from the medial two-thirds of the subscapular fossa?
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What is the coracoid process described as in Greek?
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Where does the deltoid muscle arise from?
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Which structure has a facet for the clavicle?
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From where does the supraspinatus muscle arise?
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Study Notes
Scapula
- Absent or partially absent in Cleidocranial dysostosis
- Costal surface (subscapular fossa) is concave, directed medially and forwards, marked by three longitudinal ridges
- Dorsal surface divided into supraspinous and infraspinous fossae by the spine of the scapula
- Lateral border is thick and presents the infraglenoid tubercle at the upper end
- Medial border is thin, extending from the superior angle to the inferior angle
Borders and Angles of the Scapula
- Superior border is the shortest, with the suprascapular notch near the root of the coracoid process
- Superior angle is covered by the trapezius
- Inferior angle is covered by the latissimus dorsi, moving forwards round the chest when the arm is abducted
- Lateral or glenoid angle is broad, bearing the glenoid cavity or fossa, directed forwards, laterally, and slightly upwards
Processes of the Scapula
- Spine or spinous process is a triangular plate of bone, dividing the dorsal surface into supraspinous and infraspinous fossae
- Acromion process has two borders, two surfaces, and a facet for the clavicle
- Coracoid process is directed forwards and slightly laterally, bent and finger-like, an atavistic type of epiphysis
Muscle Attachments to the Scapula
- Subscapularis muscle arises from the medial two-thirds of the subscapular fossa
- Supraspinatus arises from the medial two-thirds of the supraspinous fossa, including the upper surface of the spine
- Infraspinatus arises from the medial two-thirds of the infraspinous fossa, including the lower surface of the spine
- Deltoid arises from the lower border of the crest of the spine and from the lateral border of the acromion
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Description
Test your knowledge on the anatomy of the clavicle bone and abnormalities such as cleidocranial dysostosis. Learn about the features and surfaces of the clavicle bone.
