Podcast
Questions and Answers
What anatomical structures are bounded by the inferior corner, pectoral fold, and the medial edge of the lattissimus dorsi?
What anatomical structures are bounded by the inferior corner, pectoral fold, and the medial edge of the lattissimus dorsi?
Which muscles contribute to the anterior and posterior boundaries of the arm?
Which muscles contribute to the anterior and posterior boundaries of the arm?
What separates the anterior compartment from the posterior compartment of the arm?
What separates the anterior compartment from the posterior compartment of the arm?
Where does the intermuscular septum extend to?
Where does the intermuscular septum extend to?
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Which area is bounded by the shoulder and the cubital fossa?
Which area is bounded by the shoulder and the cubital fossa?
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What is the bone that supports the arm?
What is the bone that supports the arm?
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Which structure is a large roughening for the attachment of the deltoid muscle?
Which structure is a large roughening for the attachment of the deltoid muscle?
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What does the radial tuberosity function as?
What does the radial tuberosity function as?
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What is the triangular impression on the anteriolateral surface of the humerus?
What is the triangular impression on the anteriolateral surface of the humerus?
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Which structure lies closer to the human ulna?
Which structure lies closer to the human ulna?
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What are the ridges on the distal end of the humerus?
What are the ridges on the distal end of the humerus?
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Which structure at the distal end of the humerus articulates with the radial bone of the forearm?
Which structure at the distal end of the humerus articulates with the radial bone of the forearm?
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Which feature does the text describe as a long cylindrical bone?
Which feature does the text describe as a long cylindrical bone?
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What is attached to the capitulum and trochlea?
What is attached to the capitulum and trochlea?
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Which muscles of the forearm originates from the medial epicondyle ?
Which muscles of the forearm originates from the medial epicondyle ?
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What feature permits the insertion of 2 muscles on the posterior?
What feature permits the insertion of 2 muscles on the posterior?
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What is often associated with the patella in this text?
What is often associated with the patella in this text?
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What structure is mentioned to accommodate superior bones when moved?
What structure is mentioned to accommodate superior bones when moved?
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Study Notes
Axillary Region
- 3/4 of the axillary region is bounded by the inferior angle of the scapula and the pectoral fold
- Contains axillary vein, axillary arteries, and axillary lymph nodes
- Posterior medial boundary is formed by the medial edge of the latissimus dorsi
Arm Anatomy
- Divided into two compartments by the medial and lateral intermuscular septa
- Anterior compartment contains the humerus and is separated from the posterior compartment by the septum
- Intermuscular septum extends to the deep fascia of the flexion
The Humerus Bone
- Long, cylindrical bone that supports the arm
- Most muscles of the arm attach to the proximal humerus
- Radius and ulna help form the wrist joint and receive forearm segments from the hand
Features of the Humerus Shaft
- Deltoid tuberosity: lateral and medial heads form a large roughening for deltoid muscle attachment
- Radial tuberosity: point of attachment for the biceps brachii muscle
- Groove: distinct difference in the shaft
- Boundaries: medial boundary involved by attachment of the brachialis muscle
Distal End of the Humerus
- Flattened structure that attaches at the elbow
- Articulates with the radial bone of the forearm
- Has 3 major ridges: lateral, capitulum, and trochlea
Distal Features
- Capitulum: hemispherical projection that articulates with the human ulna
- Trochlea: poly-shaped structure that fits perfectly to the capitulum
- Ligaments: lateral and posterior ligaments attach to the capitulum and trochlea
Medial Epicondyle of the Humerus
- Origin of the medial epicondyle
- Flexor muscles of the forearm attach here
- Nerve works often through the patella
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Description
Learn about the anatomy of the upper limb, including the axillary region, arm, and its compartments. Understand the boundaries and structures of the arm and its relations to surrounding muscles.
