APHY 101 Ch 10: Skeletal Muscle Lab
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frontalis
raises eyebrows
occipitalis
pulls scalp posteriorly
Orbicularis oculi
closes eyes
Zygomaticus major
smiles
Orbicularis oris
closes mouth
Buccinator
pulls corners of mouth posteriorly
Masseter
closes mandible
Temporalis
, closes mandible
Sternocleidomastoid
rotates head
Pectoralis major
adducts or flexes arm. origin, clavicle, sternum, cartilages of the ribs. Insertion, sulcus of
humerus.
Serratus anterior
abducts scapula
Deltoid
abducts arm. origin, lateral of clavicle, acromion and spine of scapula. Insertion, deltoid
tuberosity of humerus.
Pectoralis minor
depresses scapula
Diaphragm
inspiration. Origen: inferior border of the ribs and sternum. Insertion: central tendon.
External intercostals
elevates ribs
Internal intercostals
depresses ribs
Rectus abdominis
abdomen muscles
External oblique
rotates trunk
Ivy Tech Exam Questions with correct
Answers 2025/2026 A+ Graded 100%
Verified
frontalis
raises eyebrows
occipitalis
pulls scalp posteriorly
Orbicularis oculi
closes eyes
Zygomaticus major
smiles
Orbicularis oris
closes mouth
Buccinator
pulls corners of mouth posteriorly
Masseter
closes mandible
Temporalis
, closes mandible
Sternocleidomastoid
rotates head
Pectoralis major
adducts or flexes arm. origin, clavicle, sternum, cartilages of the ribs. Insertion, sulcus of
humerus.
Serratus anterior
abducts scapula
Deltoid
abducts arm. origin, lateral of clavicle, acromion and spine of scapula. Insertion, deltoid
tuberosity of humerus.
Pectoralis minor
depresses scapula
Diaphragm
inspiration. Origen: inferior border of the ribs and sternum. Insertion: central tendon.
External intercostals
elevates ribs
Internal intercostals
depresses ribs
Rectus abdominis
abdomen muscles
External oblique
rotates trunk
