1. What is the advantage of having muscle divided into such small segments? Gros

Question

1. What is the advantage of having muscle divided into such small segments? Gross Anatomy A.Head and NeckMuscles 2. Find a source that describes what actin and myosin look ike. Explain how their shape mignt 1. Facial Muscles: unique because they insert into the soft tissue and skin to allow expression help witn their function. Use your text book to help you witn this question Muscle Action Frontalis (covers frontal bone) 3. What accounts for the striated appearance of skeletal muscle? Orbicularis Oculi 7. Explain why tendons connect muscle to bones at the end. Why wouldn't it be as effective if it Orbicularis Oris was connected in the midale or at many points aiong the bone? Temporali:s 8. What kind of connective tissue are tendons and figaments composed of? Describe the fiber Zygomaticus arrangements of this tissue. What are the advantages of this type of fibrous tissue? 2. Chewing Muscles: begin the mechanical breakdown of food Muscle Action Massete

Explanation / Answer

Gross anatomy:

1frontalis

Origin : epicranial aponeurosis

Insertion : skin around eyebrows

Action : wrinkles brow

2 orbicularis oculi

Origin : frontal bone, lacrimal bone

Insertion : eye lids

Action : close the eyelids

3 orbicularis oris

Origin: maxilla and mandibula

Insertion : skin around lips

Action : pucker lips

4 temporalis

Origin : temporalis lines of temporal bone

Insertion : Coronado process of mandible

Action : elevation and retraction of mandible

5 zygomaticus

Origin : automatic bone

Insertion : corner of mouth and upper lip

Action : raises the upper lip

6 6 stemocleidomastoid

Origin : manubrium and MEDIAL portion of clavicle

Insertion: mastoid process

Action :tilts and rotates head

Masseter

Origin: automatic arch and maxilla

Insertion : ramus of mandible

Action: elevation of mandible

2 buccinator

Origin : alveolar process of maxilla and mandible

Insertion: orbicularis oris M

Action : compresses cheek into teeth for chewing

Questions

3 skeletal muscle is straited so that means there is a dark stripe with the muscle that help it contract and strengthen muscle

7 a tendon is tough, but flexible , band of fibrous connective tissue. One ne and of the tendon connect to muscle . The other end the tendon connect to bone. Contraction of the muscle pulls on the tendon, causing the tendon to pull the bone. In this way tendons play an important role in muscle control of the body .

8crowded between the collagen fibers are rows of fibroblasts , fiber- forming cells , that generate the fibers.

Dense connective connective tissue forms strong rope- like structures such as tendons and ligaments.

Tendons attach skeletamuscles to bones they no e , essentially tendons enable you to move ;, ligaments connect bones to bones at joints helps to stabilize they surround

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