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Muscles
Origin, Insertion, Action, Relationship
39
Anatomy
Undergraduate 1
09/19/2010

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Term
Orbicularis oculi
Definition
Origin: maxilla, frontal bone (orbit)
Insertion: around eye
Action: Blinking
Term
Orbicularis oris
Definition
Origin: maxilla, mandible
Insertion: lips
Action: close lips, protrudes lips
Term
Masseter
Definition
Origin: zygomatic, maxilla
Insertion: mandible
Action: elevates mandible (closes lower jaw, clenches teeth)
Term
sternocleidomastoid
Definition
Origin: sternum, clavicle
Insertion: temporal, occipital (mastoid process)
Action: flexes neck, elevates chin, rotates head, elevates sternum
Term
Platysma
Definition
Origin: fascia of chest
Insertion: lower mandible
Action: draws mouth downward
Term
Pectoris majo
Definition
Origin: clavicle, sternum, cart. of ribs
Insertion: Humerus
Action: flexes, adducts, rotates humerus
Term
Pectoris minor
Definition
Origin: sternal ends of upper ribs
Insertion: scapula
Action: pulls scapula forward and downward, raises ribs.
Term
biceps minor
Definition
Origin: two location on scapula
Insertion: radius
Action: flexes forearm and shoulder; rotates (supinates) hand
Term
Coracobrachii
Definition
Origin: scapula
insertion: humerus
Action: weak adduction of upper arm
Relationship: deep to upper part of biceps branchii
Term
branchialis
Definition
Origin: humerus
Insertion: ulna
Action: flexes forearm
Relationship: deep to lower part of biceps branchii
Term
Triceps branchii
Definition
Origin: scapula, two location on humerus
Insertion: ulna
Action: extends forearm (aids in adduction)
Term
Deltoid
Definition
Origin: scapula, clavicle
Insertion: humerus
Action abducts upper arm; extends, flexes, and rotates humerus
Term
trapezius
Definition
Origin: occipital bone; spines of cervical and thoracic vert.
Insertions: clavicle, scapula
Actions elevates, retracts, depresses or rotates scapula
Relationships: most superficial muscle of back
Term
Latissimus dorsi
Definition
Origin: spinous processes of S,L,T, vert. ; ilium
Insertion: humerus
Actions: medial rotates arm, adducts arm, extends arm.
Term
Teres major
Definition
Origin: scapula
Insertion:hemerus
Action: medial rotates arm, adducts arm, extends arm
Term
Supraspinatus
Definition
Origin: scapula
Insertion: humerus
Action: aids in abduction of arm, weak flexion of arm, stabilizes shoulder
Relationships: part of rotator cuff
Term
infraspinatus
Definition
Origin: scapula
Insertion: humerus
Action: lateral rotation of arm; abduction of upper arm, stabilizes shoulder
relationship: part of rotator cuff
Term
Teres minor
Definition
Origin; scapula
Insertion: humerus
Action: lateral rotation of arm; weak adduction of upper arm, stabilizes shoulder
Relationship: part of rotator cuff
Term
subscapularis
Definition
Origin: scapula
Insertion: humerus
Action: medial rotation of arm, stabilizes shoulder
Relationship: part of rotator cuff
Term
Pronator quadratus
Definition
Origin: distal end of ulna
Insertion: distal end of radius
Action: pronates forearm and hand
Term
Extensor digitorum communis
Definition
Origin: humerus
Insertion: Phalanges:
Action: extends fingers and wrist
Term
Flexor digitorum profundus
Definition
Origin: ulna
Insertion: phalanges
Action: flexes distal joints of fingers
Term
external intercostals
Definition
Origin: lower margin of upper eleven rib
Insertion: superior border of rib below
Action: draw ventral part of ribs downward, decreasing the volume of the thoracic cavity.
Term
Rectus abdominus
Definition
Origin: pubic symphysis
Insertion: sternum (xiphoid process), ribs
Action: flexes vertebral column, compress abdomen
Term
internal intercostals
Definition
Origin: from the cartilages to the angles of the upper eleven ribs
Insertion: superior border of rib below
Action: draw ventral part of ribs downward, decreasing the volume of the thoracic cavity
Term
External oblique
Definition
Origin: lower ribs, linea alba
Insertion: iliac crest, linea alba
Action: compress abdomen, flex and rotate vertebral column.
Relationship: most superficial of the lateral abdominal muscles
Term
Internal oblique
Definition
Origin: Illiac crest, inguinal ligament, lumbodorsal facia
Insertion:central tendon
Action: compress abdomen
Relationship: deepest of the lateral abdominal muscles.
Term
diaphragm
Definition
sternum (xiphoidprocess), lower ribs, lumbar vertebrae
Insertion: central tendon
Action: pull central tendon downward (increase volume of thoracic cavity)
Term
Gluteus maximus
Definition
origin: sacrum, coccyx, ilium
insertion: femur; fascia
Action: extends, abducts leg, laterally rotates thigh
Term
sartorius
Definition
Origin: ilium
Insertion: tibia
Action: flexes thigh; abducts thigh, rotates thigh
Term
rectus femoris
Definition
Origin: ilium
Insertion: patella (tibia) extend leg at knee, flexes hip
Relationship: part of quadriceps femoris
Term
vastrus lateralis
Definition
Origin: femur (lateral side)
Insertion: patella (tibia)
Action: extends leg at knee,
- part of quadriceps femoris
Term
Vastus medialis
Definition
Origin femur (medial side)
Insertion: patella (tibia)
Action: extends leg at knee
- part of quadriceps femoris
Term
vastus intermedius
Definition
Origin: femur
Insertion: patella (tibia)
Actions: extends leg at knee
-part of quadriceps femoris, deep to rectus femoris
Term
Biceps femoris
Definition
Origin: ischium, fumur
Insertion: fibula, tibia
Action: flexes knee, and extension and lateral rotation at hip
-part of hamstings
Term
semitendinosus
Definition
origin ishium
insertion tibia
Action: fles and slightly medially rotates leg at knee, extends thigh at hip.
-part of hamstring
Term
semimembronous
Definition
Origin: ischium
Insertion: tibia
Action flexes and slightly medially rotates leg at knee, extend thigh at hip
-part of hamstrings
Term
soleus
Definition
Origin fibula, tibia
Insertion - calcaneus
Action: plantar flexion (adducts foot)
Term
Gastrocnemius
Definition
Origin: femur
Insertion: calcaneus
Action: plantar flexion; flexion of leg at knee
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