Multiple Choice
Which bony landmark can be palpated on the anterior surface of the body, close to the midline?
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1. Introduction to Anatomy & Physiology
Anatomical Terms for the Front of the Trunk
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Where is the pectoralis major muscle located on the human body?
A
On the posterior (back) of the trunk, covering the scapular region
B
On the anterior (front) chest wall, superficial to the ribs and pectoral region
C
In the deep anterior abdominal wall, inferior to the umbilical region
D
On the lateral thigh, overlying the femur
Verified step by step guidance1
Step 1: Understand the anatomical regions mentioned in the options. The posterior trunk refers to the back side of the torso, including the scapular (shoulder blade) region.
Step 2: Recall that the pectoralis major is a large, fan-shaped muscle primarily involved in movements of the shoulder joint, such as flexion, adduction, and medial rotation of the humerus.
Step 3: Identify that the pectoralis major is located on the anterior (front) chest wall, lying superficial to the ribs and covering the pectoral region, which is the area over the upper chest.
Step 4: Eliminate options that place the muscle in unrelated regions, such as the deep anterior abdominal wall (which is below the chest and related to abdominal muscles) or the lateral thigh (which involves muscles of the leg).
Step 5: Conclude that the correct location of the pectoralis major muscle is on the anterior chest wall, superficial to the ribs and pectoral region.
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