Lab 6 (Unit 2) Flashcards
1
Q
Skeletal Muscle
A
- striated
- long and cylindrical
- many nuclei
- voluntary
2
Q
Cardiac Muscle
A
- striated
- one nucleus
- intercalated disks
- involuntary
3
Q
Smooth Muscle
A
- not striated
- one nucleus
- spindle-shaped
- involuntary
4
Q
Orbicularis Oris
A
- sphincter/circular
- puckers/closes lips
5
Q
Orbicularis Oculi
A
- sphincter/circular
- closes eyelids
6
Q
Frontalis
A
-raises eyebrows
7
Q
Buccinator
A
-tightens cheeks
8
Q
Extraocular muscles
A
- superior oblique muscle
- superior rectus muscle
- lateral rectus muscle
- inferior rectus muscle
- inferior oblique muscle
- medial rectus
9
Q
Temporalis
A
- muscles of mastication
- elevates and retracts mandible > closes the jaw
10
Q
Masseter
A
- muscle of mastication
- elevate the mandible > close the jaw
11
Q
Pterygoids
A
- muscle of mastication
- elevates and protracts mandible > side to side grinding
12
Q
Genioglossus
A
- muscle of the tongue
- protracts tongue
13
Q
Sternocleidomastoid muscle (SCM)
A
- Muscle of the neck
- unilateral: flexes neck to same side while rotating head to face opposite side and upwards
- bilateral: extends head on neck while flexing the neck towards sternum
14
Q
Erector spinae muscle
A
- Intrinsic back muscle
- includes: spinalis, longissimus, lliocostals
- bilateral: extend trunk, head, and neck
- unilateral: laterally flex trunk, head, and neck
15
Q
Diaphragm
A
- muscle of the thorax
- main muscle of respiration
- Inspiration: diaphragm contracts and increases the size of the thoracic cavity
- expiration: diaphragm relaxes and decreases the size of the thoracic cavity
