(5) Muscular System Flashcards
Origin: ligaments of the dorsal midline
Insertion: scapular spine
Primary Actions: lifts, advances, & retracts scapula
Innervation: accessory n.
m. trapezius
Origin: ligaments of the dorsal midline
Insertion: medial side scapular cartilage
Primary Actions: lifts & advances scapula, lifts neck
Innervation: cervical & thoracic spinal nn.
m. rhomboideus
Origin: transverse processes of caudal cervical & cranial thoracic vertebrae, first 8 or 9 ribs
Insertion: medial side of scapula & scapular cartilage
Primary Actions: supports trunk, lifts neck, advances & retracts scapula
Innervation: cervical spine nn, long thoracic n.
m. serratus ventralis
Origin: fascia of shoulder & arm
Insertion: transverse processes of cranial cervical vertebrae
Primary Actions: advances limb, lateral next flexion
Innervation: cervical spine n,
m. omotransversarius
Origin: Occipital bone, transverse processes of cervical vertebrae
Insertion: medial fascia of arm & forearm, lateral side of humerus, deltoid tuberosity
Primary Actions: lateral neck flexion, shoulder extension, advances limb
Innervation: cervical spine nn., accessory n.
m. brachiocephalicus
m. cleidobrachialis
m. cleidocephalicus
(m. cleidomastoideus)
Origin: spinous processes of thoracic & lumbar vertebrae
Insertion: medial humerus
Primary Actions: limb retraction, shoulder flexion
Innervation: thoracodorsal n.
m. latissimus dorsi
Origin: sternum & cranial costal cartilages
Insertion: medial humerus & fascia of arm & forearm
Primary Actions: limb adduction
Innervation: cranial & caudal pectoral nn.
m. pectoralis superficialis (superficial pectoral m.)
Origin: sternum, ribs, abdominal fascia
Insertion: craniomedial humerus
Primary Actions: adduction & retraction of limb, advances trunk when limb is weight-bearing
Innervation: cranial & caudal pectoral nn.
m. pectoralis profundus (deep pectoral m.)
Origin: supraspinous fossa of scapula
Insertion: greater tubercle of humerus
Primary Actions: stabilization & extension of shoulder
Innervation: suprascapular n.
m. supraspinatus
Origin: infraspinous fossa of scapula
Insertion: greater tubercle of humerus
Primary Actions: stabilization & flexion of shoulder
Innervation: suprascapular n.
m. infraspinatus
Origin: subscapular fossa
Insertion: medial humerus
Primary Actions: shoulder stabilization
Innervation: subscapular n.
m. subscapularis
Origin: caudal border of scapula
Insertion: medial humerus (teres major tuberosity)
Primary Actions: shoulder flexion
Innervation: axillary n.
m. teres major
Origin: caudal border scapula
Insertion: proximal to deltoid tuberosity
Primary Actions: shoulder flexion
Innervation: axillary n.
m. teres minor
Origin: scapular spine
Insertion: deltoid tuberosity
Primary Actions: shoulder flexion
Innervation: axillary n.
m. deltoideus
Origin: coracoid process of medial humerus scapula
Insertion: medial humerus
Primary Actions: shoulder extension
Innervation: musculocutaneous
m. coracobrachialis
Origin: supraglenoid tubercle
Insertion: cranial aspect of proximal radius & ulna
Primary Actions: elbow flexion, shoulder extension
Innervation: musculocutaneous
m. biceps brachii
Origin: caudal aspect of proximal humerus
Insertion: medial aspect of proximal radius
Primary Actions: elbow flexion
Innervation: musculocutaneous n.
m. brachialis
Origin: caudal border of scapula, proximal humerus
Insertion: olecranon process
Primary Actions: elbow extension, shoulder flexion (long head only)
Innervation: radial n.
m. triceps brachii
Origin: caudolateral humerus
Insertion: olecranon process
Primary Actions: elbow extension
Innervation: radial n.
m. anconeus
Origin: caudal border of scapula (via epimysium of triceps m.)
Insertion: olecranon pascess, deep antebrachium
Primary Actions: elbow extension, tensing of forearm fascia
Innervation: radial n.
m. tensor fasciae antibrachii
Origin: lateral humeral epicondyle
Insertion: cranial aspect of proximal metacarpus
Primary Actions: carpal extension
Innervation: radial n.
m. extensor carpi radialis
Origin: craniolateral radius
Insertion: medial metacarpus
Primary Actions: carpal extension
Innervation: radial n.
m. extensor carpi obliquus (abductor digiti I longus)
Origin: lateral humeral epicondyle
Insertion: distal phalanx
Primary Actions: digital extension, carpal extension
Innervation: radial n.
m. extensor digitorum communis (common digital exensor m.)
Origin: lateral collateral ligament of elbow, proximal radius & ulna
Insertion: dorsal aspect of digit
Primary Actions: digital extension, carpal extension
Innervation: radial n.
m. extensor digitorum lateralis (lateral digital extensor m.)
Origin: lateral humeral epicondyle
Insertion: lateral metacarpus, accessory carpal bone
Primary Actions: carpal flexion
Innervation: radial n.
m. extensor carpi ulnaris (m. ulnaris lateralis)
Origin: medial humeral epicondyle
Insertion: medial aspect proximal radius
Primary Actions: elbow flexion
Innervation: median n.
m. pronator teres
Origin: medial humeral epicondyle
Insertion: palmeromedial aspect of proximal metacarpus
Primary Actions: carpal flexion
Innervation: median n.
m. flexor carpi radialis
Origin: medial humeral epicondyle, olecranon
Insertion: accessory carpal bone
Primary Actions: carpal flexion
Innervation: ulnar n.
m. flexor carpi ulnaris
Origin: medial humeral epicondyle
Insertion: middle phalanx
Primary Actions: digital flexion, carpal flexion
Innervation: ulnar n.
m. flexor digitorum superficialis (superficial digital flexor m.)
Origin: medial humeral epicondyle, caudal radius, medial olecranon
Insertion: palmar surface of distal phalanx
Primary Actions: digital flexion, carpal flexion
Innervation: median & ulnar nn.
m. flexor digitorum profundus (deep digital flexor m.)
Origin: Sacrum, sacrosciatic ligament, ischial tuber
Insertion: Patellar ligament, patella, & tibia via femoral & crural fascia, calcaneal tuber
Primary Actions: Extension of hip & stifle (cranial part of m.); flexion of stifle & extension of hock (caudal part)
Innervation: Caudal gluteal & tibial nn.
m. biceps femoris Im. gluteobiceps in ruminants)
Origin: Sacrum & caudal vertebrae, sacrosciatic ligament, ischial tuber
Insertion: Cranial tibia, crural fascia, calcaneal tuber
Primary Actions: Extension of hip, stifle, & hock (when weight-bearing); flexion of stifle (when limb off ground)
Innervation: Caudal gluteal & tibial nn.
m. semitendinosus
Origin: Caudal vertebrae, sacrosciatic ligament, ischial tuber
Insertion: Medial distal proximatedial
Primary Actions: Extension of hip & stifle (when weight-bearing); flexion of stifle (when limb off ground)
Innervation: Caudal gluteal & tibial nn.
m. semimembranosus
Origin: Ventral aspects of lumbar vertebrae, ilium, sacrum
Insertion: Lesser trochanter of femur
Primary Actions: Flexion of hip
Innervation: Ventral branches of lumbar spinal nn.
m. iliopsoas
Origin: Ilium
Insertion: Medial fascia of stifle
Primary Actions: Flexion of hip, extension of stifle
Innervation: Femoral n.
m. sartorius
Origin: Proximal femur (vastus mm), body of ilium (m. rectus femoris)
Insertion: Patella
Primary Actions: Extension of stifle, flexion of hip (rectus only)
Innervation: Femoral n.
m. quadriceps femoris:
- m. rectus femoris
- m. vastus lateralis
- m. vastus intermedius
- m. vastus medialis
Origin: Tuber coxae
Insertion: Fascia lata
Primary Actions: Flexion of hip, extension of stifle
Innervation: Cranial gluteal m.
m. tensor fasciae latae
Origin: Gluteal fascia
Insertion: Third trochanter of femur
Primary Actions: Abduction of hip
Innervation: Cranial & caudal gluteal nn.
m. gluteus superficialis
Origin: Wing of ileum, tuber coxae, sacrum, sacrosciatic ligament
Insertion: Greater trochanter of femur
Primary Actions: Extension of hip
Innervation: Cranial gluteal n.
m. gluteus medius
Origin: Body of ilium
Insertion: Greater trochanter of femur
Primary Actions: Abduction of hip
Innervation: Cranial gluteal n.
m. gluteus profundus
Origin: Pelvic symphysis
Insertion: Medial aspect tibial crest
Primary Actions: Adduction of limb
Innervation: Obturator n.
m. gracilis
Origin: Pubis
Insertion: Medial aspect proximal tibia
Primary Actions: adduction of limb, flexion of hip
Innervation: Obturator n.
m. pectineus
Origin: Ventral pelvis
Insertion: Medial femur
Primary Actions: Adduction of limb
Innervation: Obturator n.
m. adductor
Origin: Ventral sacrum
Insertion: Caudal proximal femur
Primary Actions: Outward rotation of hip, hip extension
Innervation: Sciatic n.
m. quadratus femoris
Origin: Ventral pelvis, covering obturator foramen
Insertion: Trochanteric fossa of proximal femur
Primary Actions: Outward rotation of hip, limb adduction
Innervation: Obturator n.
External obturator m. (m. obturatorius externus)
Origin: (Absent in ruminants) foramen insturator pelvic canal
Insertion: Trochanteric fossa of proximal femur
Primary Actions: Outward rotation of hip, hip extension
Innervation: Sciatic n.
Internal obturator m. (m. obturatorius internus)
Origin: Ischium
Insertion: Trochanteric fossa of proximal femur
Primary Actions: Outward rotation of hip, hip extension
Innervation: Sciatic n.
mm. gemelli
Origin: Lateral aspect of lateral femoral condyle
Insertion: Caudoproximal tibia
Primary Actions: Stifle flexion
Innervation: Tibial n.
m. popliteus
Origin: Caudal aspect of femoral condyles
Insertion: Tuber calcanei
Primary Actions: Hock extension
Innervation: Tibial n.
m. gastrocnemius
Origin: Caudodistal femur, between heads of m. Gastrocnemius
Insertion: Tuber calcanei, plantar aspect of middle phalanx
Primary Actions: Hock extension, digital flexion
Innervation: Tibial n.
m. flexor digitorum superficialis (superficial digital flexor m.)
Origin: Craniolateral aspect proximal tibia
Insertion: Medial tarsus & metatarsus
Primary Actions: Flexion of hock
Innervation: Peroneal n.
m. tibialis cranialis
Origin: Extensor fossa of distolateral femur
Insertion: Cranial aspect of distal tarsus & proximal metatarsus
Primary Actions: Flexion of hock
Innervation: Peroneal n.
m. peroneus tertius
Origin: Head of fibula & lateral femoral condyle
Insertion: Plantar aspect of distal tarsus & metatarsus
Primary Actions: Flexion of hock
Innervation: Peroneal n.
m. peroneus longus
Origin: Extensor fossa of distolateral femur
Insertion: Dorsal aspect of distal phalanx
Primary Actions: Flexion of hock, extension of digits
Innervation: Peroneal n.
m. extensor digitorum longus (long digital extensor m.)
Origin: Proximal fibula
Insertion: Middle phalanx (artiodactyls), tendon of long digital extensor (Equidae)
Primary Actions: Flexion of hock, extension of digits
Innervation: Peroneal n.
m. extensor digitorum lateralis (lateral digital extensor m.)
Origin: Proximocaudal tibia
Insertion: Plantar aspect distal phalanx
Primary Actions: Extension of hock, flexion of digits
Innervation: Tibial n.
m. flexor digitorum profundus (deep digital extensor m.)