10. Upper Extremity Myology Flashcards
For the Pectoralis Major M.
What are the attachments?
O: Medial 1/2 of clavicle and anterior surface of stenum, costal cartilages 1-6
Lateral Edge of the Intertubercular Groove of Humerus
(covers the long head of Biceps Brachii M)
For the Pectoralis Major M.
What are the major actions?
- Adduct and Medially Rotate Humerus
- Protract and Depress Scapula
- Flex Humerus
- Return Humerus from flexed to neutral
For the Pectoralis Major M.
What is the innervation and artery?
Nerve: Lateral and Medial Pectoral Nerve
Artery: Pectoral Branch of the Thoracoacromial Trunk
For Pectoralis Minor M.
What are the attachments?
- I: Upper Ribs (3-5)
- O: Coracoid Process of the Scapula
For Pectoralis Minor M.
What is the action?
Stabilizes the Scapula by holding it to the Thoracic Wall.
For Pectoralis Minor M.
What is the innervation and artery?
Nerve: Medal Pectoral Nerve
(It gets pity innervated on the way to the Pectoralis Major M.)
Artery: Pectoral Branch of the Throacoacromial Trunk
For the Subclavius M.
What are the attachments?
First rib
to
Inferior aspect of the Clavicle at the subclavian groove
For the Subclavius M.
What is the Action?
Depresses the Clavicle
For the Subclavius M.
What is the innervation and artery?
Nerve: Nerve to the Subclavius M. (c5-c6)
Artery: Clavicular Branch of the Thoracoacromial Trunk
For the Serratus Anterior M.
What are the attachments?
Lateral Aspect of the Ribs
to
Deep surface of the medial border of the Scapula.
For the Serratus Anterior M.
What are the actions?
Protraction of the Scapula: Stabalizes the Scapula by pulling it to the Thoracic Wall
(Boxer’s Serratus Anterior Muscles are buff for this reason)
Superior Rotation of the Glenoid Cavity
(Pulls the medial border down towards the ribs - lateral end goes up)
For the Serratus Anterior M.
What is the innervation and artery?
Nerve: Long Thoracic Nerve
Artery: Lateral Thoracic Artery
What might damage to the Long Thoracic Nerve cause?
What motion does this prevent?
“Winging” of the Scapula
The Scapula is no longer Stabalized against the Thoracic Wall
Abduction of the Upper Extremity beyond the Horizontal Position
For the Deltoid M.
What are the Attachments?
Lateral 1/3 Clavicle, Acromion of the Scapula, and Deltoid Tubercle (on the spine) of the Scapula
to
Deltoid Tuberosity of the Humerus
For the Deltoid M.
What are the actions?
Anterior part: Flex and Internal Rotation of the Humerus
Middle Part / Whole Muscle: Abduction of the Humerus
Posterior Part: Extension of the Shoulder and External Rotation of the Humerus
For the Deltoid M.
What is the innervation and artery?
Nerve: Axillary Nerve
Artery: Posterior Circumflex Humeral Artery
For the Subscapularis M.
What are the attachments?
Medial Aspect of its Subscapular Fossa
to
Lesser Tubercle of the Humerus
For the Subscapularis M.
What are its actions?
Medial Rotation of the Humerus
Adduction of the Humerus
For the Subscapularis M.
What is the innervation and artery?
Nerve: Upper and Lower Subscapular Nerve
Artery: Subscapular Artery
For the Supraspinatus M.
What are the attachments?
Supraspinous Fossa of the Scapula
to
Greater Humeral Tubercle (running over the superior-most part of the Humerus)
For the Supraspinatus M.
What is the action?
- Abduction of the Humerus with deltoid M., holds the humeral head in the glenoid cavity
- lateral rotation
For the Supraspinatus M.
What is the innervation and artery?
Nerve: Suprascapular Nerve
Artery: Suprascapular Artery
For the Infraspinatus M.
What are the attachments?
Medial border of its Infraspinous Fossa
Greater Tubercle of the Humerus
For the Infraspinatus M.
What is its action?
Lateral rotation of Humerus, holds the humeral head in glenoid cavity
For the Infraspinatus M.
What is the innervation and artery?
Nerve: Suprascapular Nerve
Artery: Suprascapular Artery and Circumflex Scapular Artery
(The Circumflex Scapular Artery comes around the lateral border of the scapula and heads superiorly and medially)
For the Teres Major M.
What are the attachments?
Posterior aspect of the Inferior Angle of the Scapula
to
Intertubercular groove
(Front of the Humerus)
For the Teres Major M.
What are the actions?
- Medially rotate the humerus
- Adduction of the Humerus
For the Teres Major M.
What is the innervation and artery?
Nerve: Lower Subscapular Nerve
Artery: Subscapular Artery and Circumflex Scapular Artery
Teres Minor:
O: Middle part of lateral border of scapula
I: greater tubercle of humerus
A: laterally rotate the humerus and holds humeral head in the glenoid cavity
N: Axillary Nerve
What are the four rotator cuff muscles?
Supraspinatus M.
Infraspinatus M.
Teres Minor M.
Subscapularis M.
For the Triangular Space
What Muscles make up the border?
What can be found within?
Borders: Teres Major, Teres Minor, Long Head of Triceps Brachii M.
Contains: Circumflex Scapular Artery and Vein
For the Quadrangular Space
What Muscles make up the four borders?
What can be found within?
Borders: Long and Lateral Head of the Triceps Brachii M., Teres Major M. Teres Minor M.
Contains: Axillary Artery, Posterior Circumflex Humeral Artery, Posterior Circumflex Humeral Vein
(Contents are headed to the Deltoid Muscle, so if you remember the Deltoid M.’s nerve and artery, there you go)
For the Triangular Interval
What Muscles make up its three borders?
What does it contain?
Borders: Long and Lateral Head of the Triceps Brachii, Teres Major M.
Contains: Deep Brachial Artery and Vein, Radial Nerve
What part of the Biceps Brachii M. covers the Pronator Teres M.?
What is this?
- The Bicipital Aponeurosis
- Part of the bicep tendon inserts here , and blends w the antibracial fascia to make the biceptal aponerousis
- it protects gooey stuff in cubodial fosa that we dont want to stick a needle into
- it isnt an attachment point
For the Biceps Brachii M.
What are the attachments?
- Long Head to the Supraglenoid Tubercle
- Short Head to the Coracoid Process
Both insert on the Radial Tuberosity
The Biceps Brachii skips the Humerus entirely
For the Biceps Brachii M.
What are the Actions?
Flexes Shoulder and Elbow
Supinates forearm
Remember that these Muscles Flex / Extend the Joints they cross
For Biceps Brachii M.
What is the innervation and blood supply?
- Musculocutaneous Nerve
- Brachial artery
For the Coracobrachialis Muscle
What are the attachments?
- Coracoid Process
- Medial Aspect of the Humeral Body
For the Coracobrachialis Muscle
What are the actions?
Flexion and adduction of the Shoulder
For the Coracobrachialis Muscle
What is the innervation?
Musculocutaneous N.
Brachial Artery
For the Brachialis Muscle
What are the attachments?
Distal half of the Humerus
Ulnar Tuberosity / Coranoid Process
For the Brachialis Muscle
What is the action?
Flexion of the Elbow
The Bicep cannot flex a pronated Elbow. The Brachialis does that.
For the Brachialis Muscle
What is the innervation?
Musculocutaneous N.
Brachial A.
For the Triceps Brachii M.
Where are the attachments?
- Long Head to the Infraglenoid Tubercle
- Lateral and Medial Head come from the Humerus (and do not cross the shoulder joint)
- All insert into the Olecranon of the Ulna
For the Triceps Brachii M.
What is the action?
Extending the Forearm, long head resist dislocation of ths shoulder
For Triceps Brachii Muscle
What is the innervation?
- Radial Nerve
- Deep brachial artery
For the Anconeus Muscle
What are the attachments?
Lateral Humeral Epicondyle
Olecranon
(Even though it attaches to the Lateral Humeral Epicondyle like an extensor and exists entirely in the forearm, it’s considered a posterior compartment Brachial Muscle for this class. This may be because some people consider it to be a continuation of Triceps Brachii M.)
For the Anconius Muscle
What is the action?
Extends the Elbow (with triceps brachii M.) and stabalizes the elbow joint
For the Anconius Muscle
What is the innervation?
Radial Nerve
For the Pronator Teres M.
What are the attachements?
- Superfical layer of flexor 1
- Humeral Head to the Medial Epicondyle of the Humerus
- Ulnar Head to the Coranoid Process of the Ulna
- Both insert into the lateral aspect of the Radius
For the Pronator Teres M.
What is the action?
Pronation of the Elbow (drag radius into pronation)
For the Pronator Teres M.
What is the innervation?
Median Nerve
For the Flexor Carpi Radialis M.
What are the attachments?
- Superfical layer of flexor 2
- Medial Humeral Epicondyle
- Metacarpal of the Second Digit
For the Flexor Carpi Radialis M.
What are the actions?
- Flex the Elbow and Wrist
- Abduct the Wrist
For the Flexor Carpi Radialis M.
What is the innervation?
Median Nerve
For the Palmaris Longus Muscle
What are the attachments?
- Superfical layer of flexor 3
- Medial Humeral Epicondyle
- Palmar Aponeurosis