KIN 100 - Arm (lecture 8) Flashcards

1
Q

Describe the ulna

A
  • stabilizing bone in the forearm
  • ulna is medial to, and longer than, the radius
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2
Q

Describe the radius

A

the bone that rotates during pronation and supination

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3
Q

What are the anterior compartment muscles of the arm (3)

A
  1. biceps brachii
  2. Brachialis
  3. Coracobrachialis
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4
Q

Biceps brachii

A

Proximal attachment: Long head: supraglenoid tubercle
Short head: coracoid process

Distal attachment: radial tuberosity

Innervation: Musculocutaneous nerve

Action: Forearm supination, weak elbow flexion, assist with shoulder flexion and abduction

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5
Q

What are the posterior compartment muscles of the arm (2)

A
  1. Triceps brachii
  2. Anconeus
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6
Q

Which tendon is anchored within the bicipital groove by the transverse humeral ligament

A

long head of biceps brachii

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7
Q

Which tendon attaches to the coracoid process

A

short head of biceps brachii

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8
Q

Do biceps brachii have any attachments to the humerus

A

no

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9
Q

where does Brachialis lie

A

deep to biceps brachii

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10
Q

Brachialis

A

proximal attachment: distal half of anterior surface of humerus

distal attachment: coronoid process

Innervation: Musculocutaneous nerve

Action: elbow flexion

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11
Q

What do biceps brachii and brachialis have in common

A

same innervation - musculotcutaneous nerve

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12
Q

Coracobrachialis

A

proximal attachment: coracoid process

distal attachment: mid shaft of humerus, medial side

Innervation: musculocutaneous nerve

Action: shoulder flexion, shoulder adduction

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13
Q

Triceps brachii

A

Proximal attachment: - Long head: infraglenoid tubercle
- lateral head: Posterior surface of humerus, proximal and lateral to the radial groove
- medial head: posterior surface of humerus , distal and medial to the radial groove

Distal attachment: Olecranon process of ulna

Innervation: radial nerve

Action: elbow extension

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14
Q

Anconeus

A

proximal: lateral epicondyle of humerus

distal: lateral surface of olecranon and proximal shaft of ulna

Innervation: radial nerve

Action: Tenses the elbow capsule so that it doesn’t get pinched during extension

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15
Q

When does the brachial artery arise

A

When the axillary artery passes the inferior border of teres major

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16
Q

Where does the profunda brachii (deep brachial artery) arise

A

arises proximally in the arm and accompanies the radial nerve in the posterior compartment

17
Q

Describe the continuation of the brachial artery

A

continues distally , traveling alongside the median nerve until it reaches the cubital fossa (anterior aspect of elbow joint)

18
Q

What are the three superficial veins

A
  1. Cephalic vein
  2. Basilic vein
  3. Median cubital vein
19
Q

Describe the location of the cephalic vein

A
  • begins on the lateral aspect of the hand and travels proximally up the lateral side of the upper limb
  • located on deltopectoral triangle
20
Q

Where does the cephalic vein drain into

A

the terminal part of the axillary vein

21
Q

Describe the location of the basilic vein

A

begins on the medial aspect of the hand and travels proximally up the medial side of the upper limb

22
Q

Which vein unites with the brachial vein to form the axillary vein

A

the basilic vein

23
Q

Describe the orientation of the median cubital vein and its function

A

crosses anterior to the cubital fossa

communicates with the cephalic and basilic veins

24
Q

What are the four main nerves that passes through the arm

A
  1. Musculocultaneous
  2. Median
  3. Ulnar
  4. Radial
25
Where does the musculotcutaneous nerve branch from
the lateral cord of the brachial plexus
26
What does musculocutaneous nerve pierce through and where does it lie in between
- pierces coracobrachialis - lies between muscle bellies of biceps brachii and brachialis
27
What muscles does the musculocutaneous nerve supply
All three 3 mucles of the anterior compartment of the arm (biceps brachii, brachialis, coracobrachialis )
28
What does the median nerve branch from
the medial and lateral cords of the brachial plexus
29
What does the median nerve run alongside with
the brachial artery
30
What arm muscles does the median nerve supply
no branches and supplies no muscles in the arm - supplies most muscles of the anterior forearm and hand
31
What does the ulnar nerve branch from
branches from the medial cord of the brachial plexus
32
What arm muscles does the ulnar nerve supply
supplies no arm muscles
33
What does the ulnar nerve pass through
the groove between the medial epicondyle and the olecranon process
34
What nerve is responsible for the feeling of "hitting your funny bone"
pinching of ulnar nerve between medial epicondyle and another harder surface
35
What muscles does the ulnar nerve supply
one and a half musles in the anterior forearm and many muscles in the hand
36
Where does the radial nerve branch from
posterior cord of the brachial plexus
37
What compartment does the radial nerve pass into and what bone does it travel through
- the posterior compartment of the arm with the profunda brachii artery - travels within the radial/spiral groove of the humerus
38
What muscles does the radial nerve supply
all muscles of the posterior compartment of the arm
39
Near the lateral epicondyle, what does the radial nerve split into and describe them
1. Deep branch that supplies muscle (posterior forearm compartment) 2. superficial branch that supplies the skin