Muscles of the Forelimb Part 2 Flashcards
latissimus dorsi origin
thoracolumbar fascia from spinous process of lumbar and last 7-8 thoracic vertebrae; muscular attachment to last 2-3 ribs
aponeurotic CT
latissimus dorsi insertion
teres major tuberosity of the humerus and teres major tendon
latissimus dorsi action
flex shoulder joint and adduction
latissimus dorsi innervation
thoracodorsal nerve
Deep layer
deep pectoral, subclavian, rhomboid, serrates ventralis
Which portion of the deep pectoral is deep?
cranial
which portion of the deep pectoral is superficial?
caudal
what is the official name of deep pectoral?
pectoralis profundus
what is the official name of subclavian muscle?
subclavius
what is the official name of the rhomboid muscle?
rhomboideus
what is the official name of the ventral serrate muscle?
serrates ventralis
deep pectoral origin
ventral part of the sternum and median raphe
deep pectoral insertion
lesser tubercle of the humerus, crest of greater tubercle
deep pectoral action
pull the trunk cranially, extend shoulder when contracts, adduct limb
is origin or insertion static
origin
is origin or insertion mobile
insertion
How many parts of the rhomboideus
cervical, thoracic, capital
Where does the rhomboideus lie?
deep to trapezius
What part of the rhomboideus gives extension to the head
capitis
rhomboideus insertion
medial aspect of the dorsal part of the scapula
rhomboideus cervicis origin
spinous process of cervical vertebrae (C1-C3) and medial raphae
rhomboideus thoracis origin
spinous processes of the cranial thoracic vertebrae (t4-T7)
rhomboideus capitis origin
occipital crest or nuchal crest
rhomboideus action
abduction and adduction of forelimb
characteristic of serrates ventralis
serrated edge (fan shaped)
serratus ventralis insertion
dorsomedial third of the scapula (serrated face)
serratus ventralis action
support trunk and depress scapula
serratus ventralis innervation
ventral branches of cervical spinal nerves and long thoracic nerve C7
serratus ventralis origin
transverse process of C3-C7 and first 7-8 ribs ventral to middle
serratus ventralis has two portions
cervicis and thoracis
lateral shoulder muscles
supraspinatus, infraspinatus, deltoid, teres minor
medial shoulder muscles
teres major, subscapular, coracobrachial
supraspinous fibers
two different fiber directions
which is larger: supraspinatus or infraspinatus?
supraspinatus
supraspinatus is covered by cervical part of:
trapezius and omotransversarius
supraspinatus origin
supraspinous fossa
supraspinatus insertion
greater tubercle of the humerus
supraspinatus action
extends shoulder joint when contracts, stabilizes shoulder
supraspinatus innervation
supra scapular nerve
what is another term for extend
fix, stabilize
infraspinatus shape
fusiform (spindle)
infraspinatus origin
infraspinous fossa
infraspinatus insertion
lateral side of the greater tubercle of the humerus
bursa is found between
tendon and caudal part of the greater tubercle
infraspinatus action
extend or flex, abduct shoulder, rotate shoulder laterally
infraspinatus action when weight baring
prevent medial rotation, lateral stability to shoulder
infraspinatus innervation
suprascapular nerve
deltoideus heads
pars scapularis (scapular) and pars acromialis (acromion) which FUSE
deltoideus origin
spine and acromial process of scapula
deltoideus insertion
deltoid tuberosity
deltoideus action
flex shoulder
deltoideus innervation
axillary nerve
teres minor shape
wedge
teres minor origin
infraglenoid tubercle and distal third of caudal border of scapula
teres minor insertion
teres minor tuberosity of humerus
teres minor action
flex shoulder, rotate shoulder laterally, prevent medial rotation when weight baring
teres minor innervation
axillary nerve
is teres minor lateral or medial
lateral
is teres major lateral or medial
medial
teres major origin
caudal angle and caudal border of scapula, caudal surface of subscapularis
teres major insertion
teres major tuberosity of the humerus
teres major action
flex shoulder, rotate shoulder medially, prevent lateral rotation when weight baring
teres major innervation
axillary nerve
coracobrachialis shape
spindle
coracobrachialis location
crosses medial surface of shoulder obliquely
coracobrachialis has what on top
synovial sheath
coracobrachialis muscle belly
distal to lesser tubercle and medial to origin of medial head of triceps
coracobrachialis origin
coracoid process of the scapula
coracobrachialis insertion
crest of lesser tubercle of humerus proximal to teres major tuberosity
coracobrachialis action
adduct, extend, stabilize shoulder
coracobrachialis innervation
musculocutaneous nerve
the conjoined tendon of teres major and latissimus doors crosses:
insertion of coracobrachialis
subscapularis origin
the sub scapular fossa
subscapularis insertion
lesser tubercle of the humerus
subscapularis action
adduct, extend, medially stabilize shoulder
subscapularis action weight bearing
rotate shoulder medially and prevent lateral rotation
subscapularis innervation
subscaupular nerve
muscles of the elbow
brachial, biceps, triceps, anconeus, tensor of ante brachial fascia
tensor fasciae antebrachii shape
thin strap
tensor fasciae antebrachii origin
fascia of lateral latissimus dorsi
tensor fasciae antebrachii insertion
olecranon
tensor fasciae antebrachii action
elbow extension
tensor fasciae antebrachii innervation
radial
brachialis shape
long, thin
brachialis lies where
in brachial spiral groove
brachialis origin
lateral aspect of proximal 1/3 of humerus
brachialis insertion
ulnar and radial tuberosities
brachialis action
elbox flexion
brachialis innervation
musculocutaneous nerve
biceps brachii - how many heads
1
biceps brachii shape
fusiform (spindle)
biceps brachii splits where
at distal extremity, splits into two insertions
How many heads in triceps brachii?
4 - lateral, long, medial, accessory
Which triceps brachii heads are lateral?
lateral, long, part of accessory
which triceps brachii heads are medial?
long, accessory, medial
triceps brachii insertion
olecranon tuber
triceps brachii long head origin
caudal border of scapula
triceps brachii lateral head origin
tricipital line of humerus
triceps brachii accessory head origin
neck of humerus
triceps brachii medial head origin
crest of lesser tubercle
triceps brachii action
shoulder flexion (long head only) and extension of elbow
triceps brachii innervation
radial nerve
anconeus origin
lateral supracondylar crest, medial and lateral humeral epicondyles
anconeus insertion
lateral aspect of proximal ulna
anconeus action
elbow extension
anconeus innervation
radial nerve