Question

1.which muscles would be used to turn head to right?be specific about with side muscles would be used.

2. list and describe the actions of the three muscles that attach to the coracoid process of the scapula either as the origin or the insertion.

3.List the muscles of respiration and describe their roles

4. List the assigned muscles necessary to rotate the torso to the right. identify the paired muscle involved as left or right.

5. discuss the relationship between the three cords of the branchial plexus and their position in relation to the axillary artery.

6.Describe the abdominal muscle involved in sitting up from a supine position.

7. describe the articulation points between the parts of the ribs and their corresponding point on the thoracic vertebrae.

Answer 1

1. The muscles used for head turning or cervical rotation is carried by sternocleidomastoid muscle of opposite side. Right turning of the head or right side cervical rotation is carried out by left sternocleidomastoid muscle. Other muscles used are trapezius and splenius group of muscles.
2. Corocaid process of the scapula gives attachment to following muscles :

- pectoralis minor is inserted at the coracoid process. It heps to stabilize the scapula and draws the scapula anteriorly and inferiorly.
- coracobrachialis originates from coracoid process and helps shoulder flexion and adduction.
- biceps originates from coracoid process and is responsible for forearm supination and elbow flexion.
3. The process of respiration involves inspiration and expiration. Expiration is a passive process and do not require muscle contraction.
Rhe main muscles of inspiration are diaphragm and external intercostal muscles. The diaphragm contraction helps in increasing the vertical diameter of the thorax and elevation of lower ribs.
External intercostal muscles helps in upward and outward movement of rib cage.
The other accessory muscles of inspiration are sternocleidomastoid muscle that elevates the sternum, scalene that elevates upper ribs and pectoralis minor.
4. The rotation of torso is known as lumbar rotation.
External and internal oblique muscle, transversus abdominis, semispinalis of the same side i.e. right help in right rotation of torso.

Multifidus muscle of left side causes trunk rotation on right side.