Axial Skeleton Bones and Muscles Instructor Date POST-LABORATORY TOPIC REVIEW QU

Question

Axial Skeleton Bones and Muscles Instructor Date POST-LABORATORY TOPIC REVIEW QUESTIONS To be handed in to your professor next week 1. Name 3 muscles that control facial expression and describe their functions. Which muscle has anatomical attachments to both the occipital bone and the clavicle? Describe its general function in anatomical terms. 2. 3. Flexion of the spine occurs along which anatomical plane? 4. Which muscles are responsible for flexing the lumbar spine? 5. What is the origin of a muscle and describe its characteristics. 6. What is the insertion of a muscle and describe its characteristics. 7. The Serratus anterior muscle would be most helpful for performing which of the following actions? a. b. c. d. Reaching for an object behind you. Reaching for an object in front of you. Turning your head to the left. Turning your head to the right.

Explanation / Answer

Qno1.

1.Frontalis and the Occipital Muscles

These muscles are part of the epicranius and primarily responsible to create the expressions of surprise and fright by tightening the entire scalp.

2.Corrugator Supercilii and Procerus Muscles

These muscles are located where the top nose meets the forehead and are responsible for the expression of frowning.

3.Palperbral Levator Superioris Muscle.

commonly known as levitator for short .it is the muscle which lifts the upper eye lid in the second part of the blinking action and maintains the correct level of the upper lid when the eye is open.

4.Orbicularis Oculi Muscle

this is responsible for closing your eyelids when blinking and allowing you to squint or wink your eyes.

5.Nasalis Muscle

This is responsible for flaring your nostrils.

Some other muscles responsible for facial expression are

Smiling and laughing – Zygomaticus Major.

Sadness – Levator labii superioris, levator angulioris.

Grief – Depressor Anguli Oris.

Anger – Dilator naris and depressor septi.

Frowning – Corrugator Supercilii, Procerus.

Horror, terror, fright – Platysma.

Surprise – Frontalis.

Qno2.Trapezius Muscle.

functions of trapezius muscle are as.

Movement of the scapula in towards the spine

Movement of the rotation of the scapula .

Movement of the Scapula in an up or down direction.

Movement of the head and neck in a backwards direction

Movement to the side of the head and neck

Assisting in breathing-

Qno3.Flexion is the anatomical name for forward bending.

It occurs in sagittal plane.

Qno4.Rectus Abdominus.

Qno5.

origin of Rectus Abdominus is Crest of pubis.

characteristics of Rectus Abdominus.

It is activated while doing crunches because it pulls the ribs and the pelvis in and curves the back. it is also used when a child is delivered, during bowel movements, and coughing. Breathing in and holding the rectus abdominis in pulls in the abdomen

During the exercise this muscle layers of fat disappear from the abdomen, the exposed rectus abdominis muscle creates the look of a “six pack.”it improves performance in sports that require jumping.

Qno7.b.Reaching for an object in front of you.because

The muscle is named from Latin: serrare = to saw, referring to the shape, anterior = on the front side of the body.

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