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Muscles of the Axial System
Muscles associated with the Axial Musculoskeletal System
21
Anatomy
Undergraduate 3
04/09/2012

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Term
Frontalis
Definition
O=Galea Aponeurotica
I=Skin of eyebrows; bridge of nose
A=Raises eyebrows
Term
Orbicularis Oculi
Definition
O=Medial edge of Orbit
I=Skin of eyelids
A=Closes eyes
Term
Orbicularis Oris
Definition
O=Maxilla and Mandible
I=Lips
A=Compresses/purses lips
Term
Buccinator
Definition
O=Alveolar Processes of Mandible and Maxilla
I=Orbicularis Oris
A=Compresses Cheeks
Term
Platysma
Definition
O=Acromion of Scapula and Superior Thorax
I=Mandible and skin of cheek
A=Tenses skin of neck and depresses Mandible
Term
Masseter
Definition
O=Zygomatic Arch
I=Mandibular Ramus
A=Elevates Mandible
Term
Temporalis
Definition
O=Temporal Lines on Parietal Bone
I=Coronoid Process of Mandible
A=Elevates Mandible
Term
Pterygoids
Definition
O=Sphenoid Bone
I=Mandibular Ramus
A=Elevates Mandible; Moves Jaw Laterally
Term
Digastricus
Definition
O=Mastoid Process of Temporal, Mandible
I=Hyoid Bone
A=Depresses Mandilbe; Elevates Larynx
Term
Sternoceidomastoid
Definition
O=Manubrium of Sternum; Clavicle I=Mastoid Process of Temporal A=Together these muscles flex the neck; if acting separately, they bend the head to one side.
Term
External Intercostals
Definition
O=Inferior border of rib
I=Superior border of next rib
A=Elevates rib cage; inspiration
Term
Internal Intercostals
Definition
O=Superior border of rib
I=Inferior border of preceding rib
A=Depresses rib cage; Expiration
Term
Rectus Abdominis
Definition
O=Pubis
I=Costal Cartilages and Xiphoid Process
A=Flexes Vertebral Column
Term
External Oblique
Definition
O=Ribs
I=Linea Alba and Iliac Crest
A=Compresses Abdomen; Flexes Spine
Term
Internal Oblique
Definition

O=Lumbodorsal Fascia and Iliac Crest

I=Ribs; Xiphoid Process; Linea Alba

A=Compresses Abdomen; Flexes Spine

Term
Transverse Abdominis
Definition
O=Ribs; Iliac Crest; Lumbodorsal Fascia
I=Linea Alba
A=Compresses Abdomen
Term
Trapezius
Definition
O=Clavicle and Scapula
I=Occipital Bone and Vertebrae
A=Extends neck
Term
Splenius
Definition
O=Cervical and Thoracic Vertebrae
I=Mastoid Process
A=Together they extend the neck; separately they rotate the head to the side.
Term
Iliocostalis
Definition
O=Ribs; Iliac and Sacral Crests
I=Cervical Vertebrae and Ribs
A=Extends Vertebral Column
Term
Longissimus
Definition
O=Cervical, Thoracic, and Lumbar Vertebrae
I=Cervical Vertebrae and ribs
A=Extends Vertebral Column
Term
Spinalis
Definition
O=Cervical, Thoracic, and Lumbar Vertebrae
I=Axis and Thoracic Vertebrae
A=Extends Vertebral Column
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