Axial Muscles Flashcards
Buccinator
O: Maxilla & Mandible
I: Orbicularis Oris
A: Compresses Cheeks
Depressor labii inferioris
O: Mandible
I: Skin - Lower lip
A: Depresses and helps evert lower lip
Levator labii superioris
O: Maxilla
I: Orbicularis Oris
A: elevates and everts upper lip
Mentalis
O: Mandible
I: Skin - chin
A: elevates lower lip
Orbicularis Oris
O: Maxilla & Mandible
I: lips
A: compresses, purses lips
Risorius
O: Parotid Fascia
I: angle of mouth
A: Draws corner of mouth laterally
Depressor anguli oris
O: Mandible
I: Skin - angle of mouth
A: depresses & draws corner of mouth laterally
Zygomaticus Major
O: zygomatic bone
I: Angle of Mouth
A: elevates and draws corners of mouth laterally
Zygomaticus Minor
O: zygomatic bone
I: Upper lip
A: elevates upper lip
Orbicularis Oculi
O: Maxilla
I: skin around eyes
A: closes eye
Levator palpebrae superioris
O: sphenoid
I: superior palpebrae
A: elevates upper eyelid (palpebrae)
Procerus
O: Nasal bone
I: Skin - forehead
A: pulls skin between eyebrows downward (frown)
Nasalis
O: Maxilla
I: bridge of nose
A: compresses bridge of nose
Occipitofrontalis (frontal belly)
O: epicranial aponuerosis
I: Skin - eyebrow & bride of nose
A: Raises eyebrows, wrinkles forehead
Occipitofrontalis (occipital belly)
O: occipital bone
I: epicranial aponuerosis
A: tenses and retracts skelp
Platysma
O: facia near clavical
I: mandible and skin of cheek
A: tenses skin of neck, depresses mandible
Inferior Rectus
O: sphenoid
I: Inferior, medial surface of eyeball
A: Eye looks down
Medial Rectus
O: Sphenoid
I: medial surface of eyeball
A: eye looks medially
Superior Rectus
O: Sphenoid
I: superior surface of eyeball
A: Eye looks up
Lateral Rectus
O: Sphenoid
I: Lateral surface of eyeball
A: Eye looks laterally
Inferior Oblique
O: Maxilla
I: inferior, lateral surface of eyeball
A: Eye rolls, looks up & laterally
Superior Oblique
O: Sphenoid
I: Superior, lateral surface of eyeball
A: Eye rolls, looks down and larerally
Masseter
O: Zygomatic arch
I: Mandible
A: closes jaw
Medial Pterygoid
O: Pterygoid process
I: Mandible
A: Closes jaw, mandible side to side
Temporalis
O: temporal line of skull
I: mandible
A: Elevates mandible
Lateral Pterygoid
O: Pterygoid Process
I: Mandible
A: Opens jaw, Mandible side to side
Digastric
O: Mandible
I: Hyoid
A: Depresses mandible
Geniohyoid
O: Mandible
I: Hyoid
A: Depresses mandible
Mylohyoid
O: Mandible
I: Hyoid
A: Elevates floor of mouth
Omohyoid
O: Scapula
I: Hyoid
A: Depresses hyoid & larynx
Sternohyoid
O: Clavicle
I: Hyoid
A: Depresses hyoid
Sternothyroid
O: Sternum
I: Thyroid cartilage of larynx
A: Depresses hyoid
Thyrohyoid
O: Thyroid cartilage of larynx
I: Hyoid
A: Depresses hyoid bone
Sternocleidomastoid
O: Clavicle
I: Mastoid region
A: Flex the neck
Splenius capitis
O: Spinous processes of C & T vertebrae
I: Occipital bone
A: Extend neck
Spinalis
O: Spinous processes of C & T vertebrae
I: Spinous processes of C & T vertebrae
A: Extend neck & vertebral column
Longissimus
O: Transverse processes of C & T vertebrae
I: Spinous process of C & T vertebrae
A: Extends vertebral column
Illiocostalis
O: Iliac & sacral crests
I: Inferior surface of ribs
A: Extends vertebral column
Scalenes
O: Transverse processes of C vertebrae
I: Superior surface of ribs 1,2
A: Elevate rib/flex neck
External intercostals
O: Inferior border of ribs
I: Superior border of more inferior rib
A: Elevate ribs
Internal intercostals
O: Superior border of ribs
I: Inferior border of more superior rib
A: Depress ribs
External oblique
O: External and inferior borders of ribs 5-12
I: Linea alba
A: Compresses abdomen
Internal oblique
O: Iliac crest
I: Linea alba
A: Compress abdomen
Transversus abdominis
O: Iliac crest
I: Linea alba
A: Compresses abdomen
Rectus abdominis
O: Hip bone
I: Sternum
A: Depresses ribs
Diaphragm
O: Xiphoid process
I: Central Tendon sheet
A: Expands thoracic cavity
Bulbospongiosus (male)
O: Perineal body
I: Penis
A: Stiffens penis
Bulbospongiosus (female)
O: Perineal body
I: Clitoris
A: Stiffens clitoris
Ischiocavernosus
O: Ischium
I: Corpus cavernosum of penis or clitoris
A: Compresses penis or clitoris
Coccygeus
O: Ischium
I: Sacrum
A: Elevates pelvic floor
Iliococcygeus
O: Ischium
I: Coccyx
A: Tenses pelvic floor
Pubococcygeus
O: Pubis
I: Coccyx
A: Tenses pelvic floor
External anal sphincter
O: Tendon from coccyx
I: Encircles anal opening
A: Closes anal opening
Dilator Nasi
O: Nasal bone
I: Nostrils
A: Flares nostrils
