One action of the teres major is extension . This muscle is considered to be __both posterior and inferior __ relative to the muscle's LOA (Line Of Action)

Question

BlackTom AI · Accepted Answer

The prompt presents a question about the teres major and asks us to select the actions and positional relationships described by the options.

First, consider the action: extension.
- The teres major crosses the shoulder joint and, upon contraction, pulls the humerus backward, which is the action known as shoulder extension. This is a well-established action of the muscle, along with its roles in adduction and medial rotation. Therefore, identifying extension as one action of the teres major is correct.

Next, consider the positional descriptor: both posterior and inferior relative to the muscle's LOA (line of action).
- The line of action is the effective direction of pull produced by the muscle’s fibers as they shorten. The teres major originates on the posterior aspect of the scapula (near its inferior border) and inserts on the medial lip of the intertubercular groove of the humerus. Given this anatomical setup, the muscle fibers pull in a direction that is posterior to the axis of the shoulder joint and tends to be oriented in a more inferior-posterior trajectory relative to the LOA. Describing the muscle as being both posterior and inferior relative to its LOA aligns with the general orientation of its fibers and its point of attachment, which lie posteriorly and inferiorly with respect to the glenohumeral joint’s axis.

To recapitulate the reasoning for each option:
- Extension: Correct. The teres major extends the shoulder as part of its primary actions, along with adduction and medial rotation.
- Both posterior and inferior: Correct. The muscle lies posterior to the shoulder joint and pulls in a direction that can be described as inferior relative to its line of pull, consistent with its anatomical course from the posterior-inferior scapula to the medial humerus.

If there were alternative options, we would evaluate them similarly by considering whether they describe the known actions (extension, adduction, medial rotation) or the muscle’s anatomical relationship to the joint (posterior/inferior orientation relative to the LOA). In this case, the provided selections match the recognized actions and positional descriptors for the teres major.

2025FA-HES-207-001 B. ONQ#11 SJ

One action of the teres major is extension . This muscle is considered to be both posterior and inferior relative to the muscle's LOA (Line Of Action)

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