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Flashcards in Anatomy Deck (38)
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Origin and insertion of the anterior deltoid?

Origin: Corocoid process
Insertion: Deltoid tuberosity
Action: flexion


Origin and insertion of the medial deltoid?

Origin: acromion process
Insertion: Deltoid tuberosity
Action: abduction


Origin and insertion of the posterior deltoid?

Origin: scapula spine
Insertion: Deltoid tuberosity
Action: extension


4 rotator cuff muscles?

Stabilise the shoulder joint
- Subscapularis
- Teres minor
- Infraspinatus


Origin and insertion of the biceps brachii heads?

Long head: supra glenoid tubicle
Short head: Corocoid process
Both insert into bicipital apponeurosis to the radial tuberosity.

Action: flexor of the arm at the elbow joint and a supinator of the forearm (connects to radius think)


Origin and insertion of the brachialis?

Lies deep
origin: anterior of humerus
Insertion: coronoid process of ulna
Action: powerful flexor of elbow joint


Origin and insertion of the corocobrachialis?

origin: Corocoid process with the short biceps brachii
insertion: midpoint of the humerus
Action: weak flexion and adductor of shoulder
Musculocutaneous nerve pierces.


5 extrinsic muscles of the shoulder?

Trapezius, latissimus dorsi, levitator scapulae, romboids (major and minor)


Origin and insertion of the trapezius?

Origin: Skull (nuchal ligament), spinous processes c7-T12
Insertion: clavicle, acromion and scapula spine.


Action of the trapezius? Upper, middle, lower

Upper- elevate scapula and rotate during abduction of arm (think from skull to scapula going to make it rise with levator scapulae)

Middle- retract scapula (think connect to the spine contract shorten and bring in)

Lower- Depression of the scapula (pull down as connects to as low down as T12)


origin and insertion of the latissimus dorsi?

origin: T6-T12 (so ends the same point as the trapezius and diaphragm), iliac crest, inferior angle of scapula
Insertion: converge to the bicipital groove
(intertubercular groove) of humerus.

action: Extends, Adducts, medially rotates upper limb,


What is the intertubercular groove/bicipital groove?

Between the lesser (medial) and greater tubercle of the humerus.
Long tendon of biceps brachii in, anterior circumflex artery in, latissimus dorsi converge to. Teres major inserts medial to also.


Origin and insertion of rhomboid minor?

Origin: Nuchal ligament (down neck), C7-T1. (bottom half of the roots of brachial plexus)
Insertion; medial border of scapula.

Action: retract and rotate scapula( scapula to spine so brings it in)


Origin and insertion of rhomboid major?

Origin: T2-T5 (below minor) (4 processes, minor only 3)
Insertion: medial border of scapula as well
Action: same as minor- retract and rotate scapula.


Origin and insertion of Levator scapulae?

origin: C1-C4 (same as rhomboids just higher up).
Insertion: Medial border of scapula also
Action: elevate scapula.


Summary of Levator scapula and rhomboids, trapezius, latissimus dorsi origins on spinal cord?

Nuchal crest: Trapezius
C1-C4: Levator Scapulae
C7-T1: Rhomboid minor ¬
T2- T5: Rhomboid major Trapezius
T6-T12: Latissimus Dosi ¬
C7-T12: Trapezius
C7-T3: Serratus posterior superior
T11-L3: Serratus posterior inferior


Difference between teres major and teres minor?

Minor is a rotator cuff muscle, its attatched to the scapula, whereas teres major is an intrinsic muscle of the shoulder.


Teres minor insertion and origin?

Origin: Scapula Infraspinatus
Insertion: Greater tubercle of humerus
Laterally rotates the arm (its posterior whereas teres is anterior so medially rotates)


What muscle abducts the arm 0-15 degrees? To 90degrees? Above this?

Superspinatus first 15degrees, then deltoid (lateral/medial same thing) then trapezius helps.


Brachial plexus what are the roots from the spine?

C5, C6, C7, C8, T1.


Distribution of the terminal braches of the brachial plexus nerves?

Musculocutaneous is most superior - Flexor compartment of the upper arm.
From this lateral cord, the lowest, medial cord, joins to make the Median nerve- Most of the flexors of the forearm, thenar and two lumbicals.
Ulna is the lowest branch which comes from the medial cord that joins the median. (MMU)

The other distinct cord then Is the 'AR', the top from the posterior cord.
The axillary comes out below the musculocutaneous (teres minor and deltoid)
The radial goes under the ulnar (like the bone radius rotates around) Posterior muscles.


What comes out of the posterior cord of brachial plexus?

Thoraco-dorsal nerve and medial to that long thoracic nerve.


medial epicondyle is the origin of...?

many flexors of the forearm.


lateral epicondyle is the origin of..?

Many extensors of the forearm. (except carpi, extensor digitorum and digiti minimi)


What are the flexors in the forearm?

4 superficial: From medial epicondyle- flexor carpi radialis, flexor palmaris longus, flexor carpi ulnaris and pronator teres
1 intermediate: Flexor digitorum superficialis
3 deep: Flexor digitorum profundus, flexor pollicis longus, pronator quadratus


Flexor carpi ulnaris insertion? innervation?

Pisiform carpel bone and through to fifth metacarpel (little finger)
Ulna nerve
Flex and adduct the wrist (think its on medial side so will adduct towards body)


Palmaris longus insertion? Innervation?

Median nerve found directly beneath this. Medial epichondyle to flexor retinaculum.
Fun fact absent in 15% of people.
Flexion on the palm
Goes into the aponeurosis of the palm


Pronator teres origin insertion? Action?

From medial epicondyle and coronoid process of ulna to the shaft of the radius, forming the medial border of the cubital fossa.
Action is pronation as it contracts it brings the radius around the ulna


flexor carpi radialis insertion? Action?

medial epichondyle to second and third metacarpel bones (index and middle finger). flexor and abductor of wrist joint. (on lateral side so will abduct)
Median nerve.


Flexor digitorum superficialis?

Distally gives rise to 4 tendons to the phalanges deep to the flexor retinaculum within the carpel tunnel.
Flexes the wrist, metacarpophalange joint and proximal interphalangeal joint.