LAB 6 Flashcards
What is the action of your Epicranius (frontal belly) facial expression muscle?
Action: raises eyebrows, draws scalp forward
What is the action of your Epicranius (occipital belly) facial expression muscle?
Action: pulls scalp posteriorly, fixes the galea aponeurotica
What is the action of your orbicularis oculi facial expression muscle?
Action: closes eye, pulls eyebrows inferiorly
What is the action of your Orbicularis oris facial expression muscle?
Action: closes lips, protrudes lips
What is the action of your Buccinator facial expression muscle?
Action: compresses cheek
What is the action of your Zygomaticus major facial expression muscle?
Action: raises lateral corners of mouth (smiling)
What is the action of your temporalis muscle of mastication?
Action: elevates and retracts mandible, assists in side-to-side mandible movement
What is the action, origin, and insertion of your masseter muscle of mastication?
Action: elevates mandible.
Origin: zygomatic arch and zygomatic bone.
Insertion: angle and ramus of mandible
What is the action, origin, and insertion of your Sternocleidomastoid muscle of the neck and back?
Action: each alone rotates the face towards the opposite side, both together flexes the neck.
Origin: manubrium of the sternum and clavicle.
Insertion: mastoid process of the temporal bone and occipital bone.
What is the action of your external intercostals muscle used for breathing?
Action: elevates ribs for inspiration
What is the action of your internal intercostals muscle used for breathing?
Action: depresses ribs for forced expiration
What is the action of your diaphragm muscle used for breathing?
flattens the floor of the thoracic cavity, increasing the vertical dimension of the thorax, and therefore causes inspiration of air; compresses abdominal organs as in urination, defecation, and childbirth.
What is the action of your external oblique muscle of the abdomen?
Action: flexes vertebral column and compresses abdominal wall when the pair contracts simultaneously, when acting alone aids in trunk rotation and lateral flexion.
What is the action of your internal oblique muscle of the abdomen?
Action: flexes vertebral column and compresses abdominal wall when the pair contracts simultaneously, when acting alone aids in trunk rotation and lateral flexion.
What is the action of your transversus abdominis muscle of the abdomen?
Compresses abdominal contents.
What is the action, origin, and insertion of your rectus abdominis muscle of the abdomen?
Action: flexes and rotates lumbar vertebral column, stabilizes pelvis during walking, increases intra-abdominal pressure.
Origin: pubic crest and pubic symphysis of coxal bone.
Insertion: costal cartilages of ribs 5-7, xiphoid process of sternum.
