Lab Exam 2 Muscles Flashcards
(27 cards)
Frontalis
O: galea aponeurotica
I: skin of eyebrows
A: raises eyebrows; wrinkles forehead
Orbicularis Oculi
O: frontal and maxillary bones
I: eyelids
A: closes eye; squinting
Zygomaticus
O: Zygomatic Bone
I: corner of lips
A: raises corner of lips in smiling
risorius
O: fascia in cheek
I: corner of lips
A: moves corner of lip laterally
orbicularis oris
O: encircles mouth
I: encircles mouth
A: closes and purses lips
buccinator
O: maxilla and mandible
I: orbicularis oris
A: compresses cheeks
Platysma
O: fascia of chest
I: lower margin of mandible
A: tenses skin of neck
Masseter
O: zygomatic arch
I: ramus of mandible
A: elevates mandible
Temporalis
O: temporal and parietal bones
I: coronoid process of mandible
A: elevates mandible
Digastric
O: Mastoid process of temporal bone
I: lower margin of mandible
A: primary depressor of mandible; elevates hyoid during swallowing
Mylohyoid
O: Medial surface of mandible
I: midline
A: elevates floor of mouth
Sternohyoid
O: manubrium of sternum
I: hyoid
A: depresses hyoid
thyrohyoid
O: thyroid cartilage
I: hyoid bone
A: depresses hyoid
sternothyroid
O: manubrium of sternum
I: thyroid cartilage
A: depresses thyroid cartilage
sternocleidomastoid
O: manubrium of sternum and medial clavicle
I: mastoid process of temporal bone
A: flexes and rotates head
Splenius capitis
O: spinous processes of upper thoracic vertebrae
I: mastoid process of temporal bone
A: extension and rotation of head
semispinalis capitis
O: lower cervical vertebrae
I: occipital bone
A: extends head
Scalenes
O: transverse processes of cervical vertebrae
I: first two ribs
A: flex and rotate neck; elevates first two ribs
diaphragm
O: inferior ribs, sternum and costal cartilages
I: central tendon
A: increases volume of thoracic cavity when inhaling
external intercostals
O: inferior border of each rib
I: superior border of rib below
A: elevates ribs when inhaling
Internal intercostals
O: superior border of each rib
I: inferior border of each rib above
A: depresses rib when exhaling
external oblique
O: distal margins of lower ribs
I: linea alba; inguinal ligament
A: flex abdomen; compresses abdomen; rotates abdomen
internal oblique
O: iliac crest
I: linea alba; inguinal ligament
A: flex abdomen; compress abdomen; rotate abdomen
Transverse abdominis
O: lumbar vertebrae
I: linea alba; inguinal ligament
A: flex abdomen; compress abdomen
