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anatomy > shoulder and brachial plexus > Flashcards

shoulder and brachial plexus Flashcards

1
Q

what are functions of the pectoral girdle

A

attachment of the upper limb to the trunk
attachment site for upper limb muscles
allows upper limb to be mobile
-moves scapula freely

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2
Q

scapula-anterior
subscapular fossa

A

attachment site for subscapularis muscle

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3
Q

scapula-anterior
coracoid process

A

attachment site for biceps brachii, pectoralis major and corachobrachialis muscle

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4
Q

scapula -posterior

A

articulation with the humerus

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5
Q

intrinsic shoulder muscles

A

deltoid and teres major

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6
Q

intrinsic shoulder muscles
deltoid

A

origin: lateral third of clavicle, acromion, and spine of scapula
insertion: deltoid tuberosity of humerus
action: arm abduction
innervation: axillary nerve

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7
Q

intrinsic shoulder muscles
teres major

A

origin: posterior scapula surface at inferior angle
insertion: lesser tubercule on anterior humerus
action: adducts and medially rotates the humerus, and extends
innervation: lower subscapular nerve

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8
Q

rotator cuff muscles, primary function, attachment, and innervation

A

supraspinatus
infraspinatus
teres minor
subscapularis
primary function: reinforce the joint capsule and hold the humeral head in place
attachment: attach from the scapula to the head of the humerus
innervation: brachial plexus

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9
Q

rotator cuff muscles functions:

A

supraspinatus: assists the deltoid with arm abduction
infraspinatus: laterally rotates the arm
teres minor: laterally rotates the arm
subscapularis: medially rotates and abducts the arm

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10
Q

glenohumeral joint: shoulder joint
articulation:
ligaments

A

articulation: between the lateral humeral head and shallow glenoid cavity
ligaments: coracohumeral ligament and coraco-acromial ligament,glenohumeral ligament

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11
Q

glenohumeral joint
coracohumeral ligament

A

reinforces the capsule superiorlygl

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12
Q

glenohumeral joint
coracoacromial ligament

A

prevents the superior displacement of the lateral head

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13
Q

synovial bursae

A

provide cushioning and reduce friction between bones, tendons, and muscles around glenohumeral joint

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14
Q

abductors of the humerus

A

deltoid
supraspinatus, needs to start first

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15
Q

adductors of the humerus

A

teres minor
lat dorsi
pectoralis pajor

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16
Q

upward rotators of the scapula: medial side drops and joint cavity goes up

A

descending and ascending portions of trapezius
serratus anterior

17
Q

downward rotators of the scapula: joint cavity goes down

A

rhomboids
levator scapulae
lat dorsi
pectoralis major

18
Q

retractors of the scapula

A

middle part of traps
rhomboids
lat dorsi

19
Q

protractors of scapula

A

serratus anterior
pectoralis minor

20
Q

what is the brachial plexus formed by

A

formed by union of ventral rami spinal nerves C5-T1

21
Q

describe the brachial plexus

A
  1. roots (C5,C6,C7,C8,T1)
  2. 3 trunks: superior, middle, inferior; each has a anterior and posterior region
  3. anterior and poster divisions of trunks
  4. divisions unite to form lateral cord : superior and middle trunks, medial cord: anterior division of inferior trunk, and posterior cord: posterior divisions of all cords unite.
  5. terminal branches: musculotaneous, median nerve, ulnar nerve, axillary nerve, radial nerve
22
Q

the brachial plexus is divided into parts by the clavicle:

A

-supraclavicular: arising from roots and trunks
-infraclavicular: arising from the cords

23
Q

terminal branches
musculotaneus nerve

A

-from: lateral cord
innervates: bicep, anterior arm

24
Q

terminal branches
median nerve

A

from: from medial and lateral cord
innervates: anterior forearm and thenar

25
Q

terminal branches
ulnar nerve

A

from: medial cord
innervates: 2 muscles in forearm and hypthenar muscles. forearm: flexor carpi ulnaris and lateral side of flexor digitorum profundus

26
Q

terminal branches
axillary nerve

A

from: posterior cord
innervates: deltoid muscle

27
Q

terminal branches
radial nerve

A

from: posterior cord
innervates:. triceps brachii posterior compartment

28
Q

dermatome

A

ara of skin supplied by a single cord level or a certain peripheral nerve.

29
Q

what terminal branch nerves forms a M

A

musculotaneous, median, and ulnar nerve

anatomy (42 decks)

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