BIOL 223L Lab 5 - Muscle Anatomy
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The muscle that compresses the cheek, aids in mastication, and extends horizontally from the corners of the mouth is the:
The muscle that elevates and protrudes the lower lip is known as the:
The muscle that surrounds the lips and compresses and purses the embouchure is the:
The inferior of the two cheek muscles that retracts and elevates the corners of the mouth is the:
The muscle that surrounds the orbit and closes the eye is the:
The muscle of the epicranium or scalp is the:
This portion of the occipitofrontalis raises the eyebrows and wrinkles the forehead.
the frontal belly
This portion of the occipitofrontalis tenses and retracts the scalp.
the occipital belly
This external anterior layer of muscle on the neck functions to tense the skin and depress the mandible.
This large muscle that extends from the zygomatic arch inferiorly to the posterior mandible and moves the mandible at the temoromandibular joint is the:
This muscle located on the temporal bone aids in elevating the mandible.
This muscle articulating superiorly with the mastoid process and inferiorly with both the sternum and clavicle is called the:
List the function of both sternocleidomastoids operating in unison.
flexing the neck
List the two movements facilitated by one sternocleidomastoid muscle.
- bending the head towards the shoulder
- turning the face to the opposite side
The superficial layer of the erector spinae can be divided into what three groups?
When the muscles of the erector spinae contract together, the result is the:
extension of the vertebral column
When only one side of the erector spinae muscles contract, the result is:
lateral flexion of the vertebral column
The muscle group which connects inferior thoracic vertebrae to superior thoracic vertebrae and functions to extend the vertebral column is the:
The muscles which assist in respiration by elevating the ribs are the:
The muscles which assist in respiration by depressing the ribs are the:
List the three functions of the abdominal obliques.
- compress the abdomen
- depress the ribs
- flex or bend the spine
The primary two functions of the oblique muscle group are:
- compression of underlying structures
- rotation of the vertebral column
The muscle that is medial to the internal oblique and functions to compress the abdomen is the:
The muscle that contracts to expand the thoracic cavity and compress the abdominopelvic cavity is the:
This muscle depresses the ribs, flexes the vertebral column and compresses the abdomen and is what we commonly think of as our "six-pack."
The rectus abdominis extends from superior surface of the _______ to the inferior surface of the _______.
pubis, xiphoid process
The medial line of connective tissue anterior to the rectus abdominis is the:
The connective tissue layer covering the rectus abdominis is the:
aponeurosis of external oblique
The connective tissue layer covering the lumbar region of the posterior surface is the:
The two sheaths that cover the rectus and form the linea alba are the:
aponeurosis of the external oblique
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