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68 terms

Muscle Insertions, Origins & Actions - All

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Erector spinae
- spinalis, longissimus, iliocostalis
(A only)
A:
Together - extend vertebral column
One - lateral flexion
Splenius:
- capitis
- cervicis
(A only)
A: Together - extend neck
One - laterally flex neck to same side
transversospinalis:
- multifidis
- rotators
- semispinalis
(A only)
A:
slight extensions, delicate adj. to vertebral column
Trapezius
O - occipital bone
- spinous processes C7-T12
I - clavicle & scapula
A - varies: elevate, retract, depress scapula, extend neck
Levator scapulae
O - C1-4 transverse processes
I - vertebral border of scapula
A - scapular elevation
Rhomboid major & minor (A only)
A - scapular elevation, downward rotation
Pectoralis minor (A Only)
A - depress shoulder, downward rotation of scapula
Serratus anterior
O - ribs 1-8
I - vertebral border of scapula
A - protract shoulder, upward rotation
Pectoralis major
O - clavicle, sternum, ribs 2-6
I - greater tubercle, intertubercular sulcus
A - shoulder flexion, adduction, medial rotation
Deltoid
O - clavicle & scapula
I - deltoid tuberosity
A - shoulder abduction, flexion & extension, medial & lateral rotation
Teres major
O - scapula
I - intertubercular sulcus of humerus
A - shoulder extension, adduction, medial rotation
Latissimus dorsi
O - inferior T & al L vertebrae, ribs 8-12
I - Intertubercular sulcus
A - shoulder extension, adduction, medial rotation
Infraspinatus
O - infraspinous fossa
I - greater tubercle
A - shoulder lateral rotation
Teres minor
O - lateral border of scapula
I - greater tubercle
A - shoulder lateral rotation
Supraspinatus
O - supraspinous fossa
I - greater tubercle
A - shoulder abduction
Subscapularis
O - subscapular fossa
I - lesser tubercle
A - shoulder medial rotation
Biceps brachii
O - 2 heads:
- long head - supraglenoid tubercle
- short head - coracoid process
I - radial tuberosity
A - shoulder & elbow flexion
Triceps brachii
O - 3 heads:
- long head - superior humerus
- lateral head - posterior humerus
- medial head - posterior humerus
I - olecran of ulna
A - shoulder & elbow extension, shoulder adduction
Brachialis
O - distal humerus
I - ulnar tuberosity
A - elbow flexion
Brachioradialis
O - lateral epicondyle of humerus
I - styloid process of radius
A - elbow flexion
Coracobrachialis
O - coracoid process of scapula
I - medial humerus
A - shoulder flexion, adduction
Flexor carpi radialis
O - medial epicondyle of humerus
I - metacarpal
A - wrist flexion, abduction
Flexor carpi ulnaris
O - medial epicondyle of humerus
I - capals & metacarpals
A - wrist flexion, adduction
Pronator quadratus (A only)
A - forearm pronation
Palmaris longus
O - medial epicondyle of humerus
I - palm aponeurosis
A - wrist flexion
Extensor carpi radialis longus
O - supracondylar ridge of humerus
I - 2nd metacarpal
A - wrist extension, abduction
Extensor carpi ulnaris
O - lateral epicondyle of humerus
I - 5th metacarpal
A - wrist extension, adduction
Gluteus maximus
O - iliac crest, sacrum, coccyx
I - iliotibial tract, gluteal tuberosity
A - hip extension, lateral rotation
Gluteus medius
O - ilium & gluteal lines
I - greater trochanter of femur
A - hip abduction, medial rotation
Psoas major
O - T12-L5
I - lesser trochanter
A - hip flexion
Tensor fasciae latae
O - iliac crest & spine
I - proximal lateral tibia via iliotibial tract
A - hip flexion, medial rotation
Rectus femoris
O - iliac spine
I - tibial tuberosity
A - hip flexion, knee extension
Vastus lateralis
O - greater trochanter, linea aspera
I - tibial tuberosity
A - knee extension
Vastus medialis
O - linea aspera
I - tibial tuberosity
A - knee extension
Vastus intermedius
O - anterior & lateral femoral surface
I - tibial tuberosity
A - knee extension
Sartorius
O - iliac spine
I - medial tibia
A - lateral rotation, knee flexion
Gracilis
O - pubic ramus
I - medial tibia
A - hip adduction, medial rotation
Pectineus
O - ramus of pubis
I - lesser trochanter
A - adduction & medial rotation of hip
Adductor longus
O - ramus of pubis
I - linea aspera of femur
A - adduction, flexion & medial rotation of hip
Adductor magnus
O - ramus of pubis
I - linea aspera of femur
A - adduction, flexion, medial & lateral rotation of hip
Biceps femoris
O - long head - ischial tuberosity
- short head - linea aspera
I - lateral tibia & fibula
A - hip extension, knee flexion
Semimembranosus & semitendinosus
O - ischial tuberosity
I - medial condyle of tibia
A - hip extension, knee flexion, medial rotation
Tibialis anterior
O - lateral tibia
I - 1st metatarsal & medial cuneiform
A - ankle dorsiflexion, inversion
Extensor digitorum longus
O - lateral tibia & fibula
I - middle & distal phalanges 2-5
A - interphalangeal extension (splaying toes)
Peroneus (fibularis) longus
O - lateral tibia & fibula
I - 1st metatarsal & medial cuneiform
A - ankle plantarflextion, intertarsal eversion (ankle outwards)
Gastrocnemius
O - condyles of femur
I - calcaneus via calcaneal tendon
A - plantarflexion & inversion
Soleus
O - head of fibula
I - calcaneus via calcaneal tendon
A - plantarflection
Rectus abdominus
O - pubic bone
I - cartilage ribs 5-7, xiphoid process
A - flex vertebral column, depress ribs, compress abdomen
**RESPIRATION**
External oblique
O - ribs 5-12
I - iliac crest, linea alba
A - flex vertebral column, depress ribs, compress abdomen
**RESPIRATION**
Internal oblique
O - iliac crest, thoracolumbar fascia
I - inferior ribs, xiphoid process
A - flex vertebral column, depress ribs, compress abdomen
Transversus abdominis
O - cartilage ribs 6-12, iliac crest, thoracolumbar fascia
I - linea alba, pubis
A - compress abdomen
Diaphragm
O - xiphoid process, costal cartilage ribs 6-12, lumbar vertebrae
I - centreal tendon
A - expand thoracic cavity
**RESPIRATION**
Internal intercostals (A only)
A - depress ribs
External intercostals (A onlye)
A - elevate ribs
Orbicularis oculi
O - medial orbit
I - eyelid skin
A - close eye
Orbicularis oris
O - maxilla & mandible
I - lips
A - compress, purse lips
Buccinator
O - alveolar process of maxilla & mandible
I - orbicularis oris
A - compress cheeks
Zygomaticus major & minor
O - zygomatic
I - angle of mouth, upper lip
A - draw corners of mouth up, angle
Occipitofrontalis (frontalis)
O - galea aponeurotica
I - skin of eyebrows, nose, occipital bone
A - raise eyebrows, wrinkle forehead sklin
Platysma
O - 2nd rib & scapula
I - mandible
A - tense skin of neck, depress mandible
Temporalis
O - temporal bone
I - coronoid process
A - mastication
Masseter
O - zygomatic arch
I - ramus of mandible
A - mastication
Digastric
O - chin, mastoid process
I - hyoid
A - elevate larynx, depress mandible
Stylohyoid
O - styloid process
I - hyoid
A - elevate hyoid
Myohyoid
O - mandible
I - hyoid
A - elevate oral floor, depress mandible
Sternohyoid
O - clavicle & manubrium
I - hyoid
A - depress larynx & hyoid
Sternothyroid
O - sternum
I - thyroid cartilage (larynx)
A - depress larynx & hyoid
Sternocleidomastoid
O - sternum, clavicle
I - mastoid process (temporal)
A - bilateral: flex neck
- unilateral - rotate head to opposite side