Anatomy - Muscles Block 1 Flashcards

Terms Definitions
Pectoral Region
Pectoralis Major, Pectoralis Minor, Subclavius, Serratus Anterior
Pectoralis Major - Origin
Clavicular head- medial half of clavicle... Sternal head - runs from sternum, costal cartilages of ribs 1-6 and aponeurosis of external oblique m.
Pectoralis Major - Insertion
Intertubercular (Bicipital) groove of humerus
Pectoralis Major - Innvervation
Lateral pectoral n. and Medial pectoral n.
Pectoralis Major - Blood Supply
Lateral thoracic a. and Thoracoacromial a. (Pectoral branch)
Pectoralis Major - Function
Both Adduct and medial rotates arm... Clavicular head - flexes the shoulder... Sternocostal head - extends arm
Pectoralis Minor - Origin
Ribs 3-5 near costal cartiledge
Pectoralis Minor - insertion
Caracoid process of scapula
Pectoralis Minor - Innervation
Medial pectoral n.
Pectoralis Minor - Blood Supply
Lateral thoracic a. and Thoracromial a. (Pectoral Branch)
Pectoralis Minor - Fuction
Protracts and depresses the scapula... shoulder stabilizer
Subclavius - Origin
1st rib and 1st costal cartiledge
Subclavius - Insertion
Middle 3rd of clavicle
Subclavius - Innervation
Nerve to the subclavius C5 and C6
Subclavius - Blood Supply
Thoracoacromial a. (clavicular branch)
Subclavius - Function
Depresses and anchors the clavicle
Serratus Anterior - Origin
Lateral surfaces of ribs 1 - 8
Serratus Anterior - Insertion
Medial border of the scapula
Serratus Anterior - Innervation
Long thoracic n. C5 - C7
Serratus Anterior - Blood Supply
Lateral thoracic a.
Serratus Anterior - Function
Superiorly rotates the scapula, depress and protects scapula, holds scapula against the thoracic wall... injury causes "winged scapula"
Back Muscles - Superficial:
Trapezius, Latissimus Dorsi, Rhomboid Major, Rhomboid Minor, Levator Scapulae, Serratus Posterior Superior, Serratus Posterior Inferior
Trapezius - Origin
Laterally - Acromion, spine of scapula, lateral 3rd of clavicle
Trapezius - Insertion
Medially - Skull (medial 3rd of superior nuchal line), Cervical and thoracic spinous processes
Trapezius - Innervation
CN XI (accessory nerve), Anterior rami C3 and C4
Trapezius - Blood Supply
Transvercervical a.
Trapezius - Function
Superior - Extend skull, elevate scapula... Mid - Retract scapula... Inferior - Depress scapula... Sup. + Inf. - Superiorly Rotates Scapula
Latissimus Dorsi - Origin
Medially and Inferiorly - Spinous process (T7 - T12), Ribs 9-12, Thoracolumbar fascia, Lumbar aponorosis, Iliac crest
Latissimus Dorsi - Insertion
Laterally and superiorly - Intertubercular Bicipital groove of humerus
Latissimus Dorsi - Innervation
Thoracodorsal n. (Middle Subscapular)
Latissimus Dorsi - Blood Supply
Thoracodorsal a.
Latissimus Dorsi - Function
Extend arm, Adducts arm, Medially rotates arm
Rhomboid Major - Origin
Spinous process of T2-T5 vertebrae
Rhomboid Major - Insertion
Medial border of scapula
Rhomboid Major - Innervation
Dorsal scapular n.
Rhomboid Major - Blood Supply
Dorsal scapular a.
Rhomboid Major - Function
Retract scapula, Inferiorly rotate scapula
Rhomboid Minor - Origin
Spinous process of T1 and higher vertebrae
Rhomboid Minor - Insertion
Medial border of scapula
Rhomboid Minor - Innervation
Dorsal scapular n.
Rhomboid Minor - Blood Supply
Dorsal scapular a.
Rhomboid Minor - Function
Retract scapula, Inferiorly rotate scapula
Levator Scapulae - Origin
Transverse process of cervical vertebrae
Levator Scapulae - Insertion
Superior medial border of scapula
Levator Scapulae - Innervation
Dorsal scapular n. + anterior rami C3 + C4
Levator Scapulae - Blood Supply
Dorsal scapular a.
Levator Scapulae - Function
Elevates scapula, Inferior rotation of scapula
Serratus Posterior Superior - Origin
Cervical and thoracic spinous processes
Serratus Posterior Superior - Insertion
Upper ribs
Serratus Posterior Superior - Innervation
Intercostal nerves
Serratus Posterior Superior - Blood Supply
Intercostals a.
Serratus Posterior Superior - Function
Helps respiration, Pulls ribs up
Serratus Posterior Inferior - Origin
Thoracic and Lumbar spinous processes
Serratus Posterior Inferior - Insertion
Lower ribs
Serratus Posterior Inferior - Innervation
Intercostals n.
Serratus Posterior Inferior - Blood Supply
Intercostals a.
Serratus Posterior Inferior - Function
Helps respiration, Pulls ribs down
Back Muscles - Deep Back - Erector Spinae:
Spinalis, Longissimus, Iliocostalis
Spinalis - Origin
Spinous processes of vertebrae, Posterior sacrum and Iliac crest
Spinalis - Insertion
Spinous processes higher up
Spinalis - Innvervation
Primary dorsal rami
Spinalis - Blood Supply
Spinal a.
Spinalis - Function
Extend vertebral column, Laterally flex vertebral column
Longissimus - Origin
Transverse processes of vertebrae, Posterior sacrum and iliac crest
Longissimus - Insertion
Mastoid Process of skull
Longissimus - Innervation
Primary dorsal rami
Longissimus - Blood Supply
Spinal a.
Longissimus - Function
Extend vertebral column, Laterally flex vertebral column
Iliocostalis - Origin
Superior to transverse processes, Posterior - sacrum and iliac crest
Iliocostalis - Insertion
Angles of ribs
Iliocostalis - Innervation
Primary dorsal rami
Iliocostalis - Blood Supply
Spinal a.
Iliocostalis - Function
Extend vertebral column, Laterally flex vertebral column
Back Muscles - Deep Back - Deep Layer:
Splenius capitis et cervicis, Semispinalis capitis, Semispinalis cervicis, Multifidus, Rotatores, Interspinalis, Intertransversarii
Splenius capitis et cervicis - Origin
Spines of vertebrae T6 and higher... Transverse process of upper thoracic or cervical vertebra
Splenius capitis et cervicis - Insertion
Skull
Splenius capitis et cervicis - Innervation
Primary dorsal rami
Splenius capitis et cervicis - Blood Supply
Spinal a.
Splenius capitis et cervicis - Function
Extends neck... Laterally flex head and neck
Semispinalis capitis - Origin
Transverse process of upper thoracic or cervical vertebra
Semispinalis capitis - Insertion
Skull between superior and inferior nuchal lines
Semispinalis capitis - Innervation
Primary dorsal rami
Semispinalis capitis - Blood Supply
Spinal a.
Semispinalis capitis - Function
Extend/Laterally rotate head (cerv2).. Holds head up, keeps neck straight
Semispinalis cervicis - Origin
Cervical transverse processes
Semispinalis cervicis - Insertion
Cervical spinal processes
Semispinalis cervicis - Innervation
Primary dorsal rami
Semispinalis cervicis - Blood Supply
Spinal a.
Semispinalis cervicis - Function
Holds head up, keeps neck straight
Multifidus - Origin
Transverse processes of vertebrae S5 to C1
Multifidus - Insertion
Spinal process 2 - 4 vertebral segments up
Multifidus - Innervation
Primary dorsal rami
Multifidus - Blood supply
Spinal a.
Multifidus - Function
Extend and rotate vertebral column
Rotatores - Origin
Transverse processes
Rotatores - Insertion
Spinal processes 2 or 3 vertebrae up (1 or 2 intervertebral spaces)
Rotatores - Innervation
Primary dorsal rami
Rotatores - Blood Supply
Spinal a.
Rotatores - Function
Extends and rotates vertebral column
Interspinalis - Origin
Spinal processes
Interspinalis - Insertion
Spinal processes
Interspinalis - Innervation
Primary dorsal rami
Interspinalis - Blood Supply
Spinal a.
Interspinalis - Function
Extends vertebral canal
Intertransversarii - Origin
Transverse processes
Intertransversarii - Insertion
Transverse processes
Intertransversarii - Innervation
Primary dorsal rami
Intertransversarii - Blood Supply
Spinal a.
Intertransversarii - Function
Extends and laterally flexes vertebral canal
Lateral Cervical Region (Posterior Cervical Triangle):
Platysma, Sternocleidomastoid, Belly or Posterior Omohyoid, Scalene mm
Platysma - Origin
Skin
Platysma - Insertion
Fascia covering pectoralis and deltoid majors
Platysma - Innervation
Facial nerve CN VII
Platysma - Blood Supply
Superficial vessels of the neck
Platysma - Function
Draws skin of neck superiorly when teeth are clenched
Sternocleidomastoid - Origin
Mastoid process of the skull
Sternocleidomastoid - Insertion
Manubrium of the sternum and medial 3rd of the clavicle
Sternocleidomastoid - Innervation
Accessory nerve CN XI
Sternocleidomastoid - Blood Supply
?
Sternocleidomastoid - Function
Protects carotid a. and internal jugular v. ... Bilaterally - Pulls the head anteriorly ... Unilaterally - rotates and tilts the head (causing face to look up and away from the contracting side)
Posterior Belly of the Omohyoid - Origin
Superior border of scapula
Posterior Belly of the Omohyoid - Insertion
Inferior border of hyoid bone
Posterior Belly of the Omohyoid - Innervation
Anterior rami C1-C3
Posterior Belly of the Omohyoid - Blood Supply
?
Posterior Belly of the Omohyoid - Function
Moves and stabilizes the hyoid bone (i.e. during swallowing)
Scalene mm. - Origin
Transverse process of C2 - C7
Scalene mm. - Insertion
1st or 2nd Rib
Scalene mm. - Blood Supply
?
Scalene mm. - Function
Bilaterally - Raise first 2 ribs (heavy breathing)... Unilaterally - Flex the neck to one side. Gap between anterior and middle scalene mm. is the interscalene triangle - the subclavian artery and the brachial plexus (the blood and nerve supplies for the upper limb) pass through this gap.
Muscles of the Shoulder (Rotator Cuff):
Supraspinatus, Infraspinatus, Teres Minor, Teres Major, Subscapularis, Deltoid
Supraspinatus - Origin
Supraspinous fossa of the scapula
Supraspinatus - Insertion
Greater tubercle of humerus
Supraspinatus - Innervation
Suprascapular n.
Supraspinatus - Blood Supply
Suprascapular a.
Supraspinatus - Function
Abducts the arm... Important in 1st 15 degrees of movement
Infraspinatus - Origin
Infraspinous fossa of scapula
Infraspinatus - Insertion
Greater tubercle of humerus
Infraspinatus - Innervation
Suprascapular n.
Infraspinatus - Blood Supply
Suprascapular a.
Infraspinatus - Function
Adducts the arm.. Laterally rotates arm
Teres Minor - Origin
Scapula's lateral border
Teres Minor - Insertion
Greater tubercle of humerus
Teres Minor - Innervation
Axillary n.
Teres Minor - Blood Supply
Circumflex scapular a. and Posterior Humeral Circumflex a.
Teres Minor - Function
Adducts the arm... Laterally rotates the arm
Teres Major - Origin
Scapula's inferior angle
Teres Major - Insertion
Intertubercular (Bicipital) groove of humerus
Teres Major - Innervation
Lower subscapular n.
Teres Major - Blood Supply
Circumflex scapular and posterior humeral circumflex a.
Teres Major - Function
Addcuts the arm.. Medially rotates the arm
Subscapularis - Origin
Subscapular fossa of scapula
Subscapularis - Insertion
Lesser tubercle of humerus
Subscapularis - Innervation
Upper and lower subscapular nn.
Subscapularis - Blood Supply
Subscapular a.
Subscapularis - Function
Adducts the arm.. Medially rotates the arm
Deltoid - Origin
Clavicle, acromion, spacular's spine
Deltoid - Insertion
Deltoid tuberosity of humerus
Deltoid - Innervation
Axillary n.
Deltoid - Blood Supply
Posterior humeral circumflex a. and Thoracoacromial a. (deltoid branch)
Deltoid - Function
Abducts beyond 15 degrees of movement... Flexes arm.. Extends Arm
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Definition:

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