Muscle groups of the body Flashcards
orbicularis oculi action
eye closure
orbicularis oculi innervation
facial nerve (CN VII)
orbicularis oris action
mouth closure: closes lips, protrudes lips forward, presses lips against teeth
orbicularis oris innervation
facial nerve (CN VII)
Zygomaticus major/minor action
pull corners of lips upward
Zygomaticus major/minor innervation
facial nerve (CN VII)
Risorius action
pulls the corners of the mouth posteriorly (grin or grimace)
Risorius innervation
facial nerve (CN VII)
Frontalis (occipitofrontalis) action
raise eyebrows
Frontalis (occipitofrontalis) innervation
facial nerve (CN VII)
Buccinator action
compress cheeks
Buccinator innervation
facial nerve (CN VII)
Masseter action
jaw closure
Masseter innervation
trigeminal nerve (CN V, mandibular branch)
Temporalis action
Elevates mandible, closes jaw
Temporalis innervation
trigeminal nerve (CN V, mandibular branch)
Semispinalis Capitis origin
articular processes of inferior cervical & transverse process of superior thoracic vertebrae
Semispinalis Capitis insertion
occipital bone
Semispinalis Capitis action
extend head, laterally flexes neck to same side
Semispinalis Capitis innervation
spinal nerves
Sternocleidomastoid origin
sternal end of clavicle and manubrium
Sternocleidomastoid insertion
mastoid region of skull
Sternocleidomastoid action
neck flexion, turns face to opposite side
Sternocleidomastoid innervation
accessory nerve (CN XI)
Splenius Capitis origin
spinous process/ligaments of inferior cervical vertebrae
Splenius Capitis insertion
mastoid process, occipital bone of skull
Splenius Capitis action
extend head, laterally flexes neck to same side
Splenius Capitis innervation
cervical spinal nerves
Longissimus cervicis origin
transverse processes of superior thoracic vertebrae
Longissimus cervicis insertion
transverse process of middle and superior cervical vertebrae
Longissimus cervicis action
Bilateral extend head
Unilateral laterally flexes neck to same side
Longissimus cervicis innervation
cervical and thoracic spinal nerves
Longissimus thoracis origin
transverse process of all thoracic and lumbar vertebrae
Longissimus thoracis insertion
transverse processes of all thoracic vertebrae
Longissimus thoracis action
Bilateral extension of spine
Unilaterally: lateral flexion of spine
Longissimus thoracis innervation
thoracic and lumbar spinal nerves
Thyrohyoid origin
thyroid cartilage of larynx
Thyrohyoid insertion
hyoid bone
Thyrohyoid action
elevates thyroid, depresses hyoid bone
Thyrohyoid innervation
hypoglossal nerve
Scalenes (anterior, middle, posterior) origin
transverse processes of C2-C7
Scalenes (anterior, middle, posterior) insertion
first and second ribs
Scalenes (anterior, middle, posterior) action
elevates ribs 1 & 2
Scalenes (anterior, middle, posterior) innervation
cervical spinal nerves
Spinalis
Medial column of erector spinae
Made up of three divisions (spinalis thoracis, spinalis cervicis, and spinalis capitis)
Longissimus
Intermediate column of erector spinae
made up of three divisions (longissimus thoracis, longissimus cervicis, longissimus capitis)
Iliocostalis
Lateral column of erector spinae
Made up of three divisions (iliocostalis lumborum, iliocostalis thoracis, iliocostalis cervicis)
Rectus abdominis origin
pubic crest, pubic symphysis
Rectus abdominis insertion
pubis, cartilages of ribs 5-7, xiphoid process
Rectus abdominis action
flexion of spine, compression of abdominal viscera
Rectus abdominis innervation
spinal nerves (T 7-T 12)
External oblique origin
sternum, ribs (5-12)
External oblique insertion
linea alba, iliac crest
External oblique action
Bilaterally: flexion of the spine, compress the abdomen
Unilaterally: flexes trunk to same side, rotates to opposite side
External oblique innervation
lower intercostal, ilioinguinal nerves
Internal oblique origin
iliac crest, lumbodorsal fascia
Internal oblique insertion
inferior ribs, linea alba
Internal oblique action
compresses abdomen, depresses ribs, flexes spine
Internal oblique innervation
lower intercostal, ilioinguinal nerves
Transverse abdominis origin
lateral inguinal ligament, inner iliac crest
Transverse abdominis insertion
linea alba, pubis
Transverse abdominis action
compression of abdomen
Transverse abdominis innervation
first lumbar nerve (T 7- L1), iliohypogastric (T12-L1), ilioinguinal (T12-L1)
Diaphragm origin
cartilage of ribs 7-12, xiphoid process, lumbar vertebrae
Diaphragm insertion
anterior longitudinal ligament (vertebral column)
Diaphragm action
expands thoracic cavity, compresses abdominal cavity
Diaphragm innervation
phrenic nerve (C3-5)
External Intercostals origin
lower border of ribs 1-11
External Intercostals insertion
upper border of ribs below (2-12)
External Intercostals action
elevates ribs (normal inspiration)
External Intercostals innervation
intercostal nerves
Internal Intercostals origin
superior border of ribs 2-12
Internal Intercostals insertion
inferior of ribs above (1-11)
Internal Intercostals action
depresses ribs (forced expiration)
Internal Intercostals innervation
intercostal nerves
Trapezius (upper, middle, lower) origin
occipital bone, spinous process of T1-12
Trapezius (upper, middle, lower) insertion
lateral clavicle, acromion, and scapular spine of scapula
Trapezius (upper, middle, lower) action
rotation, retraction, elevation, depression of scapula; extends neck and stabilizes shoulder
Trapezius (upper, middle, lower) innervation
Accessory nerve (Cranial Nerve 11)
Levator scapulae origin
transverse process of C1-4
Levator scapulae insertion
medial border of scapula
Levator scapulae action
elevates scapula
Levator scapulae innervation
dorsal scapular nerve
Rhomboids (major, minor) origin
spinous process (minor: C7-T1) (major: T2-5)
Rhomboids (major, minor) insertion
medial border of scapula
Rhomboids (major, minor) action
retraction of scapula
Rhomboids (major, minor) innervation
dorsal scapular nerve
Pectoralis minor origin
Ribs 3-5
Pectoralis minor insertion
Coracoid process of scapula
Pectoralis minor action
Elevates ribs, draws scapula down and medially
Pectoralis minor innervation
Medial pectoral nerve
Serratus anterior origin
Upper 8-9 ribs
Serratus anterior insertion
Medial border of scapula
Serratus anterior action
Protraction of scapula
Serratus anterior innervation
Long thoracic nerve
Deltoid origin
clavicle and scapula
Deltoid insertion
deltoid tuberosity of humerus
Deltoid action
abduction of shoulder (whole muscle)
Deltoid innervation
axillary nerve
Latissimus Dorsi origin
spinous process of inferior thoracic and lumbar vertebrae, ribs 8-12
Latissimus Dorsi insertion
intertubercular groove of humerus
Latissimus Dorsi action
extension, adduction, and medial rotation of shoulder
Latissimus Dorsi innervation
thoracodorsal nerve
Pectoralis Major origin
ribs 2-6, body of sternum
Pectoralis Major insertion
greater tubercle of humerus
Pectoralis Major action
flexion, adduction and medial rotation of shoulder
Pectoralis Major innervation
pectoral nerve
Teres Major origin
inferior angle of scapula
Teres Major insertion
intertubercular groove of humerus
Teres Major action
extension, adduction and medial rotation of shoulder
Teres Major innervation
lower subscapular nerve
Coracobrachialis origin
coracoid process of scapula
Coracobrachialis insertion
medial shaft of humerus
Coracobrachialis action
adduction and flexion at shoulder
Coracobrachialis innervation
musculocutaneous nerve
Teres Minor origin
lateral border of scapula
Teres minor insertion
greater tubercle of humerus