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Chapter 12: Problem 34

Match each function to a muscle of the head and neck in the key. a. trapezius b arhicularis aculi c. masseter Moves head and scapula

Short Answer

Expert verified
The muscle that moves the head and scapula is the trapezius. The arhicularis aculi (orbicularis oculi) and masseter are not involved in head and scapula movement, as they control eyelid movement and facial expressions, and facilitate chewing and biting, respectively.

Step by step solution

01

T1: Function of Trapezius

The trapezius muscle is a large, diamond-shaped muscle located in the upper part of the back and neck. Its primary functions are to support the weight of the arm, move the scapula (shoulder blade), and facilitate head movement by extending, rotating, and tilting the head.
02

T2: Function of Arhicularis Aculei

The arhicularis aculi (properly known as orbicularis oculi) is a thin, circular muscle around the eye that controls eyelid movement and contributes to facial expressions. It does not participate in head or scapula movement.
03

T3: Function of Masseter

The masseter muscle is a thick, powerful muscle located in the cheek area responsible for chewing and biting by moving the lower jaw. It does not participate directly in head or scapula movement. Now, we can match each muscle to its primary function in relation to head and scapula movement. a. trapezius: Moves head and scapula (as it supports the weight of the arm, moves the scapula, and facilitates head movement) b. arhicularis aculi (orbicularis oculi): Not involved in head and scapula movement (as it controls eyelid movement and contributes to facial expressions) c. masseter: Not involved in head and scapula movement (as it is responsible for chewing and biting by moving the lower jaw)

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Most popular questions from this chapter

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