Muscles Flashcards
External oblique
Originates on the lumbodorsal fascia and ribs
Inserts on the linea alba and pubis
Action: constricts the abdomen
Internal oblique
Origin: lubodorsal fascia
Inserts: linea alba
Action: compresses the abdomen
Transverse abdominis
Origin: costal ribs
Insertion: linea alba
Action: compresses the abdomen
Recuts abdominis
Origin: pubis
Insertion: sternum and costal ribs
Action: compress abdomen
Pectoralis major
Origin: cranial sternum
Insertion: humerus
Action: adduct the forelimb
Pectoralis minor
Origin: sternum
Inserts: humerus
Action: adducts the forelimb
Sternohyoid
Origin: first costal rib
Insertion: body of the hyoid
Action: pulls the hyoid posterior
Masseter
Origin: zygomatic arch
Inserts: mandible
Action: raises the mandible
Temporalis
Origin: temporal fossa
Inserts: Coronoid process of the skull
Action: raises the mandible
Latissimus dorsi
Origin: thoracic and lumbar vertebrae
Insert: humerus
Action: pulls the arm caudodorsally
Triceps brachii (long head)
Origin: axillary border of the scapula
Insert: olecranon process of the ulna
Action: extends the forearm
Triceps brachii (lateral head)
Origin: greater tuberosity of the humerus
Inserts: olecranon process of the ulna
Action: extends the forearm
Triceps brachii (medial head)
Origin: humerus
Insert: olecranon process of the ulna
Action: extends the forearm
Biceps brachii
Origin: glenoid fossa
Insert: radius
Action: flexes the forearm
Extensor carpi ulnaris
Origin: lateral epicondyle of the humerus
Inserts: fifth metacarpal
Action: extends the fifth digit
Flexor Carpi ulnaris
Origin: medial epicondyle of humerus and the olecranon process
Inserts: pisiform
Action: flexes the carpals
Flexor carpi radialis
Origin: medial epicondyle of the humerus
Inserts: second and third metacarpals
Action : flexes the second and third metacarpals
Biceps femoris
Origin: ischium
Insert: patella and tibia
Action: abducts the thigh and flexes the shank
Gluteus Maximus
Origin: sacral and caudal vertebrae
Insert: greater trochanter
Action: abducts the thigh
Gluteus medius
Origin: caudal and sacral vertebrae
Insert: greater trochanter
Action: abducts the thigh
Deltoid
Origin : acromion process and spine of the scapula
Insertion: deltoid ridge of the humerus
Action: rotate and flex the humerus
Trapezius
Origin: spines of cervical and thoracic vertebrae
Insert: spine of the scapula
Action: pull scapula dorsally
Tibialis anterior
Origin: tibia and fibula
Insert: metatarsal
Action: flexes the foot
Gastrocnemius
Origin: femur, tendon, and fascia lata of plantaris
Insert: calcaneus
Action: extends foot
Teres major
Origin: axillary border of the scapula
Insert: humerus
Action: flexes and rotates the humerus
