Podcast
Questions and Answers
Which statement about the proximal humerus is accurate?
Which statement about the proximal humerus is accurate?
What muscle does NOT attach to the greater tuberosity of the humerus?
What muscle does NOT attach to the greater tuberosity of the humerus?
Where is the deltoid tuberosity located?
Where is the deltoid tuberosity located?
Which structures are located adjacent to the surgical neck of the humerus?
Which structures are located adjacent to the surgical neck of the humerus?
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What structure separates the greater and lesser tuberosities?
What structure separates the greater and lesser tuberosities?
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Which muscle is attached anteriorly to the humeral shaft?
Which muscle is attached anteriorly to the humeral shaft?
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The capitulum of the humerus articulates with which structure?
The capitulum of the humerus articulates with which structure?
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Which of the following muscles does NOT attach to the intertubercular sulcus?
Which of the following muscles does NOT attach to the intertubercular sulcus?
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Study Notes
Humerus Overview
- The humerus is a long bone located in the upper limb, connecting the shoulder to the elbow.
- It forms the glenohumeral joint by articulating with the scapula's glenoid fossa at the proximal end.
- At the distal end, it articulates with the radius and ulna at the elbow joint.
Proximal Humerus Structure
- Key features include the head, anatomical neck, surgical neck, greater and lesser tuberosities, and intertubercular sulcus.
- The head faces medially, upwards, and backwards, separating the greater and lesser tuberosities via the anatomical neck.
Tuberosities
- The greater tuberosity is located laterally and serves as the attachment site for three rotator cuff muscles:
- Supraspinatus (superior facet)
- Infraspinatus (middle facet)
- Teres minor (inferior facet)
- The lesser tuberosity is smaller and found medially and anteriorly, providing attachment for the subscapularis muscle.
Intertubercular Sulcus
- A deep groove between the greater and lesser tuberosities.
- The tendon of the long head of the biceps brachii runs through this groove.
- The lips of the intertubercular sulcus are attachment sites for muscles:
- Pectoralis major
- Teres major
- Latissimus dorsi
Surgical Neck and Shaft
- The surgical neck extends from below the tuberosities to the shaft and is adjacent to the axillary nerve and circumflex humeral vessels.
- The shaft of the humerus serves as an attachment site for several muscles:
- Anteriorly: coracobrachialis, deltoid, brachialis, brachioradialis
- Posteriorly: medial and lateral heads of the triceps (origins defined by the spiral groove)
Deltoid Tuberosity
- A roughened surface on the lateral side of the humeral shaft where the deltoid muscle attaches.
Radial Groove
- A shallow depression on the posterior surface that runs parallel to the deltoid tuberosity.
- Contains the radial nerve and profunda brachii artery.
Distal Region
- The capitulum, a rounded projection at the distal end, articulates with the head of the radius.
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Description
Explore the structure and function of the humerus, the long bone in the upper limb. Learn about its key features, including the proximal end's articulation with the scapula and its distal end's connection to the radius and ulna. This quiz covers the anatomy relevant to the humerus and its role in upper limb movement.
