Multiple Choice
Which phrase most accurately describes a muscle’s insertion?
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10. Muscles
Origin and Insertion
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In human anatomy, which set of bony landmarks are the origins of the deltoid muscle?
A
Inferior angle of the scapula and medial border of the scapula
B
Sternum and costal cartilages of ribs 1–6
C
Coracoid process of the scapula and the proximal medial humerus
D
Lateral third of the clavicle, acromion, and spine of the scapula
Verified step by step guidance1
Step 1: Understand the concept of muscle origin in anatomy. The origin of a muscle is the fixed attachment point, usually proximal, from which the muscle exerts force during contraction.
Step 2: Identify the deltoid muscle's general location and function. The deltoid is a large, triangular shoulder muscle responsible for arm abduction, flexion, and extension.
Step 3: Recall the bony landmarks around the shoulder region that serve as attachment points for muscles, including the clavicle, scapula, and humerus.
Step 4: Recognize that the deltoid muscle originates specifically from three bony landmarks: the lateral third of the clavicle, the acromion process, and the spine of the scapula. These provide a broad origin for the muscle's fibers.
Step 5: Differentiate these landmarks from other options such as the inferior angle and medial border of the scapula (origin of other muscles like the teres major), the sternum and costal cartilages (origin of pectoralis major), and the coracoid process (origin of muscles like the coracobrachialis).
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