Lab 7 - Axial Muscles Flashcards
Action and attachment of occipitofrontalis (frontal belly):
Action: Elevates eyebrows, wrinkles forehead
Attachments: Galea aponeurotica
Action and attachment of orbicularis oculi:
Action: Blinking, aids flow of tears
Attachments: Lacrimal bone, frontal bone, and maxilla
Action and attachment of corrugator supercilii:
Action: Draws eyebrows medially and downward
Attachments: Medial end of supraorbital margin
Action and attachment of nasalis:
Action: Widens nostrils
Attachments: Maxilla
Action and attachment of orbicularis oris:
Action: Closes and protrudes lips
Attachments: Modiolus, maxilla, and mandible
Action and attachment of levator labii superioris:
Action: Elevates and everts upper lip
Attachments: Zygomatic bone, maxilla
Action and attachment of levator anguli oris:
Action: Smiling
Attachments: Maxilla
Action and attachment of zygomaticus major:
Action: Draws angle of mouth upward and laterally
Attachment: Zygomatic bone
Action and attachment of zygomaticus minor:
Action: Elevates upper lip and exposes upper teeth
Attachments: Zygomatic bone
Action and attachment of risorius:
Action: Draws angle of mouth laterally
Attachments: Zygomatic arch
Action and attachment of depressor anguli oris:
Action: Draws angle of mouth laterally and downward (frowning)
Attachments: Inferior margin of mandibular body
Action and attachment of buccinator:
Action: Compresses cheek
Attachments: Alveolar process of mandible and maxilla
Action and attachment of mentalis:
Action: Elevates and protrudes lower lip
Attachments: Mandible
Action and attachment of platysma:
Action: Draws lower lip and angle of mouth downward
Attachments: Mandible and clavicle
Action and attachment of external oblique:
Action: Supports abdominal viscera, stabilizes vertebral column
Attachment: Ribs 5-11, anterior half of iliac crest
Action and attachment of internal oblique:
Action: Supports abdominal viscera, stabilizes vertebral column
Attachment: Ribs 10-12, iliac crest
Action and attachment of transverse abdominal:
Action: Compresses abdominal contents
Attachments: Costal cartilages 7-12, iliac crest
Action and attachment of rectus abdominis:
Action: Flexes waist
Attachments: Pubic symphysis, xiphoid process, costal cartilages 5-7
Action and attachment of temporalis:
Action: Elevation, retraction, lateral and medial excursion of the mandible
Attachments: Coronoid process (mandible), and mandibular ramus
Action and attachment of masseter:
Action: Elevation of the mandible, chewing
Attachments: Zygomatic arch, mandibular ramus, and mandibular angle
Action and attachment of sternocleidomastoid:
Action: Lifts head slightly upwards and from left to right
Attachments: Manubrium, clavicle, mastoid process
Action and attachment of digastric:
Action: Depresses mandible when hyoid is fixed, opens mouth widely
Attachments: Mastoid process (skull), hyoid
Action and attachment of sternohyoid:
Action: Depresses hyoid after it has been elevated
Attachments: Ansa cervicalis, hyoid, manubrium (sternum), medial end of the clavicle
Action and attachment of thyrohyoid:
Action: Depresses hyoid, elevates larynx, singing high notes
Attachment: Hyoid
Action and attachment of sternothyroid:
Action: Depresses larynx, signing low notes
Attachment: Manubrium, costal cartilage
Action and attachment of diaphragm:
Action: Prime mover of respiration
Attachment: Xiphoid process, ribs, and costal cartilage
Action and attachment of external intercostals:
Action: Elevates and protracts ribs 2-12
Attachment: Inferior margin of ribs 1-11
Action and attachment of internal intercostals:
Action: Compressing thoracic cavity
Attachment: Superior margin of ribs 2-12
What nerve innervates the diaphragm?
Phrenic nerve
What nerve innervates the temporalis and masseter muscles?
Trigeminal nerve
