Ex. II - Origins, Insertions & Actions Flashcards
pectoantebrachialis
o: manubrium of sternum; i: proximal end of ulna
pectoralis major
O: clavicular head; i: bicipital groove of humerus
pectoralis minor
o: 3rd to 5th ribs; i: coracoid process of scapula
external oblique
o: 5th to 12th ribs; i: illiac crest, pubic tubercle, linea alba
clavtrapezius
o: lambdoidal ridge of skull; I: raphe of clavicle
acromiotrapezius
o: spines of cervical & ant. thoracic vertebrae (C2 to T1-4); i: metacromion & scapula spine
spinotrapezius
o: spines of thoracic vert. (T1-4 to T11-13); i: scapula spine & surrounding fascia
latissimus dorsi
o: thoracic & lumbar vert. (T4-5 to L6); i: medial shaft of humerus
levator scapulae ventralis
o: transverse process of atlas and occipital bone; i: metacromion of scapule
acromiodeltoid
o: acromion of scapula; i: deltoid ridge of humerus, spinodeltoid’s outer surface & branchialis anticus
spinodeltoid
o: spine of scapula; i: deltoid ridge of humerus
clavobrachialis (clavodeltoid)
o: raphe of clavicle; i: ulna beneath semilunar notch
teres major
o: inferior angle of scapula, i: intertubercular sulcus of humerus
subscapularis
o: subscapular fossa; i: lesser tubercle of humerus
xiphihumeralis
o: xiphoid process of sternum; i: humerus
internal oblique
o: iliac crest; i: linea alba
transversus abdominis
o: iliac crest; i: xiphoid process of sternum, linea alba
rectus abdominis
o: crest of pubic bone; i: 5th to 7th ribs, xiphoid process of sternum
errector spinae
o: spinous process of T9-12; i: spinous processes of T1-2
external intercostals
o: lower border of ribs; i: upper border of posterior-ward rib
rhomboideus major (smaller); rhomboideus minor (larger-behind scapula)
o: spines of cervical & thoracic vert. (T1-4); i: vert. border of scapula & inferior angle (major)
rhomboideus capitis
o: lambdoidal ridge of skull; i: vertebral border of scapula
supraspinatus
o: supraspinous fossa of scapula; i: greater tuberosisty of humerus
infraspinatus
o: infraspinous fossa of scapula; i: lateral part of greater tuberosity of humerus
splenius
o: spinous processes of cervical vertebrae; i: mastoid process of temporal and occiptal bones
sternomastoid
o: manubrium of sternum & midventral line ant. to manubrium; i: mastoid process & lambdoidal ridge
sternohyoid
o: first costal cartilage; i: body of hyoid
digastric
o: jugular process of occipital, mastoid process of temporal; i: ventral border of mandible
mylohyoid
o: medial surface of mandible; i: median raphe- from hyoid to mandibular symphysis
masseter
o: malar & ventral border of zygomatic arch; i: mandible- ventral border & ext. carotid fossa
temporalis
o: temporal fossa of parietal, squamosal, & frontal; i: coronoid process of mandible
cleidomastoid
o: mastoid process of temporal; i: raphe of clavicle
sternothyroid
o: manubrium of sternum; i: thyroid cartilage
thryohyoid
o: thyroid cartilage; i: hyoid bone
pectoantebrachialis action
adduction of arm
pectoralis major action
flexes and extends humerus
pec. minor action
stabilizes scapula, raises ribs in inspiration
external oblique action
contralateral rotation of torso
clavotrap action
flexes forearm, turns head & extends humerus forward
acromiotrap action
draws scapula medially & holds scapulae together
spinotrap action
draws scapula dorsally & posteriorally
latissimus dorsi action
pulls humerus caudodorsally
levator scapulae ventralis action
draws scapula cranially
acromiodeltoid action
extends & rotates humerus
spinodeltoid action
extends & rotates humerus
clavodeltoid action
flexes forearm, turns head & extends humerus forward
teres major action
adduction of humerus
subscapularis action
medial rotation of humerus
xiphihumeralis action
Adducts forelimb
internal oblique action
compresses abdomen, rotation of vertebral column
transversus abdominis action
compresses abdomenal compartment
rectus abdominis action
flexion of lumbar spine
errector spinae action
extends vertebral column
scalenus action
elevation of 1st and 2nd ribs
external intercostals action
expands thorax during inhalation
rhomboideus major (smaller); rhomboideus minor (larger-behind scapula) action
draws vertebral border of scapula medially & dorsally
rhomboideus capitis action
draws dorsal border of scapula cranially (forward)
supraspinatus action
extends arm (draws humerus anteriorly)
infraspinatus action
flexes & rotates humerus laterally (outward)
splenius action
extend, rotate, and laterally flex head
sternomastoid action
turns head, depresses head & neck
sternohyoid action
draws hyoid posteriorly (caudally)
digastric action
depresses mandible
mylohyoid action
raises floor of mouth, draws hyoid posteriorly
masseter action
elevates mandible
temporalis action
elevates mandible
cleidomastoid action
rotates head, depresses snout or draws clavicle forward
sternothyroid action
depresses thyroid cartilage
thyrohyoid action
elevates thyroid, depresses hyoid bone
