Lab Exam Muscles Flashcards
Transversospinales group - Semispinalis Capitis
O:
I:
A:
N:
O: Transverse processes (4 lower cervical, 6 upper thoracic)
I: Occipital bone (Between nuchal lines)
A: Neck extension/rotation, lateral flexion
Transversospinales group - Semispinalis Cervicis
O:
I:
A:
N:
O: Transverse processes T1-5/6
I: Spinous processes C2-5
A: Back extension/rotation, lateral flexion
Transversospinales group - Semispinalis Thoracis
O:
I:
A:
N:
O: Transverse processes T6-10
I: Spinous process C6-T4
A: Back extension/rotation, lateral flexion
Transversospinales group:
Multifidus
O:
I:
A:
N:
O: Sacrum/transverse processes (inferior)
I: Spinous process (3-4 superior)
A: Back extension/rotation, lateral flexion
Transversospinales group:
Rotatores
O:
I:
A:
N:
O: Transverse process (Inferior)
I: Spinous process (1-2 superior)
A: Back extension/rotation
Erector Spinae
Spinalis group -
Sections:
O:
I:
A:
Spinalis Cervicis
O: Nuchal and C7 SP
I: Upper cervical spinous processes
A: Extends the neck
Spinalis Thoracis
O: T11-L2 SP
I: Spinous processes of superior thoracic vertebrae
A: Extends vertebral column
Erector Spinae
Longissimus group -
Sections:
O:
I:
A:
Longissimus Capitis
O: Inferior cervical/superior thoracic transverse processes
I: Mastoid process of temporal bone
A: Extends neck; lateral neck flexion/rotation
Longissimus Cervicis
O: Superior thoracic transverse processes
I: Upper cervical transverse processes
A: Extends vertebral column; lateral flexion
Longissimus Thoracis
O: Inferior thoracic/Superior lumbar transverse processes
I: Inferior thoracic/Superior lumbar transverse processes and ribs
A: Extends vertebral column; lateral flexion
Erector Spinae
Iliocostalis Group -
Sections:
O:
I:
A:
Iliocostalis Cervicis
O: Ribs 1-12
I: Transverse processes (Low C-spine)
A: Laterally flexes neck, elevates ribs
Iliocostalis thoracis
O: Ribs 6-12
I: Superior ribs and transverse of C7
A: Stabilizes vertebrae
Iliocostalis Lumborum
O: Iliac crest, sacrum, lumbar spinous processes
I: Ribs 6-12
A: Extends vertebral column, depresses ribs
Superficial Layer: Splenius Capitis
O:
I:
A:
O: C and T SP, nuchal
I: Mastoid process and occipital bone
A: Extends and laterally flexes neck
Superficial Layer: Splenius Cervicis
O:
I:
A:
O: C and T SP, nuchal
I: Atlas and Axis
A: Extends and laterally flexes neck
Rectus Abdominus
O:
I:
A:
O: Pubis
I: Ribs 5-7, Xiphoid
A: Trunk Flexion
External oblique
O:
I:
A:
O: Ribs 5-12
I: Iliac crest, pubic bone, linea Alba
A: Contralateral/towards midline rotation (unilateral), flexion (bilateral)
Internal Oblique
O:
I:
A:
O: Thoracolumbar Fascia, Iliac crest
I: Inferior borders ribs 9-12, linea alba
A: Ipsilateral inside Rotation (unilateral), flexion (bilateral)
Quadratus Lumborum
O:
I:
A:
O: Iliac Crest
I: 12th rib and transverse processes
A: Depresses Ribs, lateral flexion
Serratus Anterior
O:
I:
A:
O: Ribs 1-10
I: Medial scapula
A: Protracts scap, upward rotation
Deltoid
O:
I:
A:
O: Clavicle and scapular spine
I: Deltoid tuberosity
A: Abduction (15-90 deg), flexion, extension
Trapezius
O:
I:
A:
O: Occipital bone, nuchal ligament, spinous processes
I: Lateral clavicle, acromian scapular spine
A: Extension and lateral flexion of neck, elevation, retraction, depression
Latissimus Dorsi
O:
I:
A:
O: Spinous process, thoracolumbar fascia
I: Floor of inter-tubercular groove
A: Extension, adduction, medial rotation
Levator Scapulae
O:
A:
I:
O: C1-4 TP
I: Sup angle of scap
A: Elevation, downward scap rotation (Lat flexion if scap stationary)
Rhomboids
O:
I:
A:
O: Spinous processes
I: Medial border of scapula
A: Retraction and downward rotation
Supraspinatus
O:
I:
A:
O: Supraspinous Fossa
I: Greater Tubercle
A: Abduction for first 15 degrees
Infraspinatus
O:
I:
A:
O: Infraspinous fossa
I: Greater tubercle
A: Lateral rotation
Subscapularis
O:
I:
A:
O: Subscapular fossa
I: Lesser Tubercle
A: Medial rotation
Biceps Brachii
O:
I:
A:
Long Head
O: Supraglenoid tubercle
I: Radial Tuberosity
A: Flexion (Elbow and shoulder), Supination
Short Head
O: Coracoid process
I: Radial tuberosity
A: Flexion (Elbow and shoulder), Supination
Triceps Brachii
O:
I:
A:
Long head
O: Infraglenoid tubercle
I: Olecranon
A: Extension (Elbow and shoulder)
Medial head
O: Posterior Humerus
I: Olecranon
A: Elbow extension
Lateral head
O: Lateral humerus
I: Olecranon
A: Elbow extension
Pectoralis Major
O:
I:
A:
O: Ribs 2-6, Sternum, Clavicle
I: Deltoid tuberosity
A: Shoulder flexion, adduction, medial rotation