Anatomy Lab: Insertion/Origin/Innervation/Action Flashcards
What is the origin and insertion of the descending part of trapezius?
Originates from the external occipital protuberance, the ligamentum nuchae, and spinous processes of C1-C7
Inserts into the lateral third of the clavicle
What is the origin and insertion of the transverse part of the trapezius?
Originates from the aponeuroses at the spinous processes of T1-T4
Inserts into the acromion
What is the origin and insertion of the ascending part of the trapezius?
Originates from the spinous processes of T5 to T12
Inserts onto the scapular spine
What is the innervation of the trapezius?
Innervated by Accessory nerve CN XI and Cervical plexus C3-C4
What is the action of the descending part of the trapezius?
Draws scapula obliquely upward, rotates glenoid cavity superiorly, tilts head to same side, and rotates head to opposite side
What is the action of the transverse part of the trapezius?
Draws scapula medially
What is the action of the ascending part of the trapezius?
Draws scapula medially downward
As a whole, acts to steady the scapula on the thorax
Trapezius
What is the origin and insertion of the levator scapulae?
Originates at the transverse process of C1-C4
Inserts at the scapula (superior angle)
What is the action of the levator scapulae?
Draws scapula medially upward while moving inferior angle medially and bends neck to same side
What is the origin and insertion of the rhomboid minor?
Originates at the spinous process of C6 and C7
Inserts at the medial border of the scapula, above the scapular spine
What is the origin and insertion of the rhomboid major?
Originates at the spinnous process of T1-T4
Inserts at the medial border of the scapula below the scapular spine
The levator scapulae, rhomboid major, and rhomboid minor are all innervated by the
Innervated by Dorsal scapular nerve (C4-C5)
What is the action of the rhomboid major and minor?
Steadies scapula and draws the scapula medially upward
What is the origin of the vertebral part of the latissimus dorsi?
Originates from the spinous processes or T7-T12 and the thoracolumbar fascia
What is the origin of the scapular part of the Latissimus Dorsi?
Originates from the inferior angle of the scapula
What is the origin of the the costal part of the Latissimus Dorsi?
Originates from ribs 9-12
What is the origin of the Iliac part of the Latissimus Dorsi?
Originates from the posterior third of the iliac crest
All parts of the Latissimus Dorsi insert on the
Insert to the Crest of the lesser tuberosity of the humerus
What is the innervation of all parts of the Latissimus Dorsi?
Innervated by thoracodorsal nerve (C6-C8)
What is the action of all parts of the Latissimus Dorsi?
Internal rotation, adduction, and extension of the upper limb, and respeiration (cough muscle)
What is the origin and insertion of the Teres Major?
Originates from the inferior angle of the scapula
Inserts at the crest of lesser tuberosity of humerus
What is the innervation of the Teres major?
Innervated by Lower subscapular nerve (C5-C7)
What is the action of the teres major?
Internally rotates, adducts, and extends the upper limb
What is the origin and insertion of the Semispinalis Capitis?
Originates from the transverse and articular processes of C4-T7
Inserts onto the occipital bone between the superior and inferior nuchal lines
What is the innervation of the Semispinalis Capitis?
Innervated by spinal nerves (posterior rami)
What is the action of the Semispinalis Capitis?
Acts BILATERALLY to extend thoracic and cervical spines and head, as well as stabilizing craniovertebral joints
Acts UNILATERALLY to bend the head and cervical/thoracis spines to the same side and rotate them to opposite sides
What is the origin and insertion of the Splenius Capitis?
Originates from the ligamentum nuchae and the spinous processes of C7-T3
Inserts onto the lateral superior nuchal line of occipital bone and the mastoid process of temporal bone
What is the innervation of the Splenius Capitis
Innervated by spinal nerve (C1-C6) (posterior rami, lateral branches)
What is the action of the Splenius Capitis?
BILATERALLY acts to extend cervical spine and head
UNILATERALLY acts to flex and rotate the head to the same side
What is the origin of the pectoralis major?
Originates at the medial clavicle (clavicular), sternum and cartilage of ribs 1-6 (sternocostal), and the anterior layer of rectus sheath (abdominal part)
What is the insertion of the pectoralis major?
Inserts at the crest of the greater tuberosity of humerus
What is the action of ALL fibers of the pectoralis major?
Act to adduct and medially rotate the shoulder
What is the action of the clavicular and sternocostal parts of the pectoralis major?
Act to flex the arm at the shoulder and assist in respiration when shoulder is fixed
The pectoralis major is innervated by?
Innervated by the lateral and medial pectoral nerve (C6, 7, 8 T1)
What is the origin of the pectoralis minor?
Originates from ribs 3-5
What is the insertion of the pectoralis minor?
Inserts the medial surface of coracoid process of the scapula
What is the action of the pectoralis minor?
Acts to depress, abduct, and downwardly rotate the scapula
With the scapula fixed, the pectoralis minor acts to
With the scapula fixed, acts to assist to elevate the thorax during forced inhalation
The pectoralis minor is innervated by
Medial pectoral nerve (C8-T1)
The clavicular part of the deltoid originates from
Originates from the lateral 1/3 of the clavicle
The acromial part of the deltoid originates from
Originates from the acromion
The spinal part of the deltoid originated from the
Originates from the scapular spine
All parts of the deltoid insert onto the
Insert onto the deltoid tuberosity of the humerus
The deltoid is innervated by
Innervated by the axillary nerve (C5-C6)
The clavicular part of the deltoid acts to
Acts to flex, internally rotate, and adduct the arm at the shoulder
The acromial part of the deltoid acts to
Acts to abduct the arm at the shoulder
The spinal part of the deltoid acts to
Acts to extend, externally rotate, and adduct the arm at the shoulder
Between 60 and 90 degrees of abduction, the clavicular and spinal parts of the deltoid assist the accromial part with
Abduction
The subscapularis originates from
Originates from the subscapular fossa
The subscapularis inserts onto the
Inserts onto the lesser tuberosity of the humerus
The subscapularis is innervated by
Innervated by the subscapular nerve (C5, C6)
What is the action of the subscapularis?
Acts to internally rotate the arm at the shoulder joint
The serratus anterior originates from the
Originates from the 1st to 9th ribs
The serratus anterior inserts onto the
Inserts onto the medial border of the scapula
The serratus anterior is innervated by
Innervated by the long thoracic nerve (C5, C7)
What is the action of the superior part of the serratus anterior?
Acts to lower a raised arm
What is the action of the inferior part of the serratus anterior?
Acts to rotate the scapula laterally
What is the action of the intermediate part of the serratus anterior?
Acts with the entire muscle to draw the scapula laterally forward and elevate the ribs when the shoulder is fixed
The long head of the biceps brachii originates from the
Originates from the supraglenoid tubercle of the scapula
The short head of the biceps brachii originates from the
Originates from the coracoid process of the scapula
Both heads of the biceps brachi insert onto the
Insert onto the radial tuberosity via the common tendon and the bicipital aponeurosis of the cubital fossa
Both heads of the biceps brachii are innervated by
Innervated by the musculocutaneous nerve (C5 to C6)
Both the long and short heads of the biceps brachii act to
Act to flex the elbow and supinate the forearm
Also to flex, abduct, and internally rotate the arm at the shoulder
The coracobrachialis originates on the
Originates on the coracoid process of the scapula
The coracobrachialis inserts onto the
Inserts onto the humerus in line with the crest of the lesser tuberosity
The corocobrachiallus is innervated by the
Innervated by the musculocutaneous nerve (C5-C7)
The corocobrachiallis acts to
Acts to flex, adduct, and internally rotate the arm at the shoulder
The brachiallis originates from the
Originates from the anterior surface of the distal half of the humerus
The brachiallis crosses the elbow and inserts onto the
Crosses the elbow and inserts onto the ulnar tuberosity
The brachialis is innervated by
Innervated by the musculocutaneous nerve (C5,C6) and the radial nerve (C7)
The brachialis acts to
Acts to flex the elbow joint
The teres minor originates from the
Originates from the lateral border of the scapula
The teres minor inserts onto the
Inserts onto the greater tuberosity of the humerus
The teres minor is innervated by the
Innervated by the axillary nerve (C5, C6)
The teres minor acts to
Acts to externally rotate the arm and weakly adduct the arm at the shoulder
The long head of the triceps brachii originates from the
Originates from the infraglenoid tubercle of the scapula
The long head of the triceps inserts onto the
Inserts onto the olecranon of the ulna
The triceps brachii is innervated by
Innervated by the Radial nerve (C6-C8)
The long head of the triceps brachii acts to
Acts to extend the forearm at the elbow joint and adduct the arm at the shoulder joint
The supraspinatus originates from the
Originates from the supraspinous fossa of the scapula
The supraspinatus inserts onto the
Inserts onto the greater tuberosity of the humerus
The supraspinatus is innervated by
Innervated by the suprascapular nerve (C4 to C6)
The supraspinatus acts to
Acts to abduct the arm at the shoulder joint
The infraspinatus origintes from the
Originates from the infraspinatous fossa of the scapula
The infraspinatus inserts onto the
Inserts onto the greater tuberosity of the humerus
The infraspinatus is innervated by
Innervated by the suprascapular nerve (C4 to C6)
What are the boundaries of the scapular notch?
Superior transverse scapular ligament and the scapula
What are the boundaries of the medial border of the scapula?
The scapula
What are the boundaries of the triangular space?
The teres major and minor
What are the boundaries of the triceps hiatus?
Triceps brachi, humerus, and teres major
What are the boundaries of the quadrangular space?
Teres major and minor, triceps brachii, and the humerus
