Muscles Flashcards
Frontalis
Origin: Frontal Aponeurosis
Insertion: Skin of Eyebrow
Action: Raises eyebrow
Orbicularis oculi
Origin: Frontal bone and Maxilla
Insertion: Skin around eye
Action: Closes eye/squints
Orbicularis oris
Origin: Muscles near mouth
Insertion: Skin at corner of mouth
Action: Closes/puckers mouth
Masseter
Origin: Zygomatic arch
Insertion:Mandible
Action: Elevates Mandible
Temporalis
Origin: Temporal Bone
Insertion: Mandible
Action: Elevates Mandible
Sternocleidomastoid
Origin: Sternum and clavicle
Insertion: Mastoid processof temporal bone
Action: (both contracting) head to chest. (one contracts) head rotates
Zygomaticus major
Origin: Anterior zygomatic arch
Insertion: muscles around mouth
Action: Moves corners of mouth superiorly and posteriorly
Zygomaticus minor
Origin: Zygomatic bone
Insertion: Skin of the upper lip
Action: Moves corners of mouth superiorly and posteriorly
Splenius capitis
Origin: Spinous process, C7-T3
Insertion: Mastoid process
Action: Extend, rotate, laterally flex head
Rectus abdominis
Origin: Pubis
Insertion: Xiphoid process
Action:Compresses abdomen, flexes vertebral column
External oblique
Origin: Lower 8 ribs
Insertion:Iliac Crest
Action: (Both contract) compresses abdomen. (one contracts) vertebral column flexed to side.
Internal oblique
Origin: Iliac Crest
Insertion: Costal cartilages of inferior 3-4 ribs
Action: (Both contract) compresses abdomen. (one contracts) vertebral column flexed to side.
Transverse abdominus
Origin: Iliac crest,
Insertion: Xiphoid process, line alba, pubis
Action: Compresses abdomen
Trapezius
Origin: Occipital bone, vertebral spinous processes
Insertion: clavicle, scapula
Action: Elevates clavicle, adducts scapula, and extends head
Rhomboideus major
deep muscle
Origin: Vertebral spinous processes
Insertion: Scapula
Action: Adducts scapula and rotates it downwards
Serratus anterior
Origin: Ribs
Insertion: Scapula
Action: Rotates scapula upward and laterally rotates it downwards
Pectoralis minor
deep muscle
Origin: Ribs 3-5
Insertion: Corocoid of scapula
Action: Depresses and moves scapula anteriorly
Latissimus dorsi
Origin: Ribs, inferior 6 vertebral spines
Insertion: Humerus
Action: Extends and adducts arm