Midterm Anatomy - Nerve Artery O/I Action Flashcards
Superficial muscles of the back
Latissimus Dorsi Levator Scapulae Rhomboid Major Rhomboid Minor Trapezius
Lat Dorsi Origin and Insertion
Origin: Spines of T7 to sacrum, posterior third of iliac crest, and the lower ribs
Inserts in the humeral intertubercular groove
Lat Dorsi Action
Extends and medially rotates the arm
Lat Dorsi innervation
Thoracodorsal nerve from C7 and C8
Lat Dorsi Artery
Thoracodorsal artery
Levator Scap origin and insertion
Origin: Transverse process of C1-C4
Insert: Medial border of scapula from superior angle to the spine
Action of levator Scap
Elevates scapula
Innervation of levator scap
Dorsal scapular nerve from C5. Upper part of this muscle also receives branches from C3 and C4
Artery for levator scap
Dorsal scapular artery
Rhomboid major origin and insertion
Origin: Spines of T2-T5
Insert: Medial border of scapula inferior to the spine
Rhomboid major Action
Retracts, elevates, and rotates the scapula inferiorly
Innervation of Rhomboid major
Dorsal scapular nerve from C5
Artery for Rhomboid major
Dorsal scapular artery
Rhomboid minor origin and insertion
Origin: Spines of C7 to T1
Insertion: Medial border of scapula at the spine
Action of rhomboid minor
Retracts, elevates and rotates the scapula inferiorly
Artery for the rhomboid minor
Dorsal scapular
Trapezius origin and insertion
Origin: Medial third of superior nuchal line, external occipital protuberance, nuchal ligament, and spinous processes of C7-T12
Insert: Lateral third of clavicle, medial side of acromion and upper crest of the scapular spine
Action of the trapezius
Elevates and depresses the scapula, superiorly rotates the scapula and retracts scapula
Innervation of Trapezius
Motor: Spinal acessory nerve (XI)
Sensation: C3/C4
Artery for trapezius
Transverse cervical artery
Intermediate group of back muscles
Serratus posterior inferior
Serratus posterior superior
Origin and Insertion for serratus posterior inferior
O: Thoracolumbnar fascia and spines of T11-L2
I: Ribs 9-12
Action of serratus posterior inferior
Pulls down the lower ribs
Innervation of the serratus posterior inferior
Ventral branches of primary rami from T9-T12
Artery for serratus posterior inferior
Subcostal artery, posterior intercostal artery, first two lumbar arteries
O/I for serratus posterior superior
O: Nuchal ligament, spines of C7, and T1-T3
I: Ribs 1-4
Action of serratus posterior superior
Elevates upper ribs
Nerve for serratus posterior superior
Ventral branches of primary rami from T1-T4
Artery for serratus posterior superior
Posterior intercostal arteries
Deep back muscles
Splenius capitis and cervicis
Difference between splenius capitis and cervicis?
Everything is the same except where they insert. Capitis inserts on the Mastoid process and lateral end of the superior nuchal line and thecervis inserts on the posterior tubercles of the transverse processes of C1-C3
Origin of splenius muscles
Nuchal ligament and spines of C7-T6
Action of splenius muscles
Extends and laterally bends the neck and head as well as rotates the head to the same side
Innervation of splenius muscles
Dorsal primary rami of C2-C6
Artery for splenius muscles
Deep cervical artery and posterior intercostal arteries
Intermediate layer of Back muscles
Erector Spinae muscles
What are the erector spinae muscles
Iliocostalis, longissimus and the spinalis and in all purposes, the semispinalis
O/I of the illiocostalis
O: Iliac crest and sacrum
I: Ribs
Action of the erector spinae muscles
Extends and laterally bends the trunck and neck
Innervation of the iliocostalis
Dorsal primary rami of C4-S5
Arteries for erector spinae muscles
Deep cervical arteries, posterior intercostal arteries, subcostal arteries and lumbar arteries
O/I for longissimus
Origin: Transverse process of lower vertebrae
I: Transverse process of superior vertebrae AND mastoid process
Nerve for longissimus
Dorsal primary rami of spinal nerves C1-S1
Spinalis O/I
O: Spinous processes of inferior vertebrae
I: Spinous processes of superior vertebrae and base of the skull
Innervation of spinalis
Dorsal primary rami of spinal nerves C2-L3
O/I of semispinalis
O: Transverse processes of C7-T12
I: Capitis: Between nuchal lines of the skull
Thoracis/Cervicis: Spines of C3 to C7
Action of semispinalis
Extends and laterally bends the trunk AND rotates trunk to the opposite side
Innervation of Semispinalis
Dorsal primary rami of C1-T12
Artery for Semispinalis
Same as the other erector spinae muscles
Suboccipital triangle?
Obliquus capitis inferior and superior and rectus capitis posterior major
O/I of obliquus capitis inferior
O: Spine of the axis
I: Transverse process of atlas
Action of the obliquus capitis inferior
Rotates head to the same side
Nerve for all suboccipital muscles?
Suboccipital nerve (DPR from C1)
Artery for all suboccipital muscles
Occippital artery
O/I for obliquus capitis superior
O: Transverse process of atlas
I: Above inferior nuchal line
Action of obliquus capitis superior
Extends the head and rotates the head to the same side
O/I for rectus capitis posterior major
O: Spinous process of axis
I: Lateral portion of Inferior nuchal line
Action of rectus capitis posterior major
Extends the head and rotates it to the same side
O/I for rectus capitis posterior minor
O: Posterior tubercle of the atlas
I: Medial portion of inferior nuchal line
Action of rectus capitis posterior minor
Extends the head
O/I for deltoid
O: Lateral third of clavicle, acromion and spine of scapula
I: Deltoid tuberosity of humerus
Action of deltoid
Abducts the arm, extend, flex, medially and laterally rotate the arm
Nerve of deltoid
Axillary nerve
Artery from the deltoid
Posterior circumflex humeral artery
O/I supraspinatous
O: Supraspinous fossa
I: Greater tuberlce of the humerus
Action of supraspinatous
First 10-20 degrees of abduction of the arm
Nerve for supraspinatous
Suprascapular nerve
Artery for supraspinatous
Suprascapular artery
O/I for infraspinatous
O: Infraspinatous fossa
I: Greater tubercle of humerus
Action of infraspinatous
Laterally rotates the arm
Nerve for infraspinatous
Suprascapular nerve
Artery for infraspinatous
suprascapular artery
Teres minor O/I
O: Upper lateral border of scapula
I: Greater tubercle of the humerus
Action of teres minor
Laterally rotates the arm
Nerve for teres minor
Axillary nerve
Artery for teres minor
Circumflex scapular artery
Teres Major O/I
O: Dorsal surface of inferior angle of scapula
I: Lesser tubercle of humerus
Action of teres major
Adducts the arm and medially rotates it
Nerve for teres major
Lower Subscap nerve
Artery for teres major
Circumflex scapular artery
Subscapularis O/I
O: Subscpular fossa of scapula
I: Lesser tubercle of the humerus
Action of subscapularis
Medially rotates the arm
Nerve of subscapularis
Upper and lower Subscap nerve
Artery for subscapularis
Subscapular artery
Pec Major O/I
O: Medial half of clavicle, manubrium, body of sternum, ribs 2-6
I: Greater tubercle of humerus
Action of Pec major
Flexes and adducts the arm
Nerve for pec major
Medial and lateral pectoral nerves
Artery for pec major
Pectoral branch of the thoracoacromial trunk
Pec minor O/I
O: Ribs 3-5
I: Coracoid process of the scapula
Action of pec minor
Draws scapula forward, medial and down
Nerve for pec minor
Medial pectoral nerve
Artery for pec minor
Pectoral branch of the thoracoacromial trunk
Serratus anterior O/I
O: Ribs 1-8
I: Medial border of scapula
Serratus anterior action
Draws scapula forward and rotate scapula superiorly
Nerve for serratus anterior
Long Thoracic
Artery for serratus anterior
Lateral thoracic artery
Biceps brachii O/I
O: Short head on the coracoid process of the scapula, the long head on the supraglenoid tubercle of the scapula
I: Radial tuberosity
Action of biceps brachii
Flexes the forearm and supinates the the arm. The long head also flexes the arm
Nerve for biceps brachii
Musculocutaneous
Artery for biceps brachii
Brachial artery
Brachialis O/I
O: Anterior surface of lower one half of the humerus
I: Coranoid process of the ulna
Action of brachialis
Flexes forearm
Nerve of brachialis
Musculocutaneous nerve
Artery for brachialis
Brachial artery
Coracobrachialis O/I
O: Coracoid process of the scapula
I: Medial middle of humerus
Action of coracobracialis
Flexion and adduction of the arm
Nerve for coracobrachialis
Musculocutaneous nerve
Artery for coracobrachialis
Brachial artery
Triceps O/I
O: Long head on the infraglenoid tubercle of scapula, lateral head on the posterolateral humerus, medial head on the posteromedial inferior surface of humerus
I: Olecranon process
Action of triceps
Extends the forearm. Thel ong head extends and adducts the arm
Nerve for triceps
Radial
Artery for triceps
Deep Brachial profundus artery
Brachioradialis O/I
O: Lateral supracondyle of humerus
I: Styloid process of radius
Action of brachioradialis
Flexes elbow and assists in pronation/supination
