PBL 39 Flashcards
(52 cards)
What are the lateral, medial, superior, roof and floor borders of the antecubital fossa made from?
Lateral: brachioradialis muscle
Medial: pronator teres muscle
Superior: epicondyles of the humerus
Roof: Bicipital aponeurosis, fascia, subcutaneous fat and skin
Floor: brachialis (proximally), supinator (distally)
Contents of the antecubital fossa
Really, Need, Beer, To, Be, At, My, Nicest
- Radial nerve
- Brachial tendon
- Brachial artery
- Median nerve
Arterial supply to the upper limb
Subclavian –> Axillary –> Brachial –> Radial & Ulnar
The cephalic and basilic veins are connected at the elbow by the…
Median cubital vein
What are the 5 groups of lymph nodes in the axilla?
Pectoral (anterior) Subscapular (posterior) Humeral (lateral) Central Apical
What are the 3 bones of the shoulder?
Scapula
Humerus
Clavicle
What is the joint at which the scapula articulates with the humerus?
Glenohumeral joint
What is the name of the joint at which the scapula articulates with the clavicle?
Acromioclavicular joint
What are the main landmarks of the proximal humerus?
Head Neck Greater tuberosity Lesser tuberosity Intertubercular groove Surgical neck Deltoid tuberosity
Which nerve is affected in a surgical neck fracture and what is the consequence of this?
Axillary nerve
Sergeant’s stripes loss of sensation to the shoulder tip - paralysis to the deltoid and teres minor
What are the landmarks of the distal humerus?
Lateral epicondyle Medial epicondyle Trochlear notch Olecranon fossa Capitulum
Function of the clavicle
Attach the upper limb to the trunk = shoulder girdle
- Protects the neurovascular structures supplying the upper limb
- Transmits force from the upper limb to the axial skeleton
What are the two ligaments which make up the coracoclavicular ligament?
Conoid ligament
Trapezoid ligament
The pectoral region contains 4 muscles, what are they?
- Pectoralis major
- Pectoralis minor
- Serratus anterior
- Subclavius
Action and innervation of the pectoralis major
Action: Adducts and medially rotates the upper limb and draws the scapula anteroinferiorly.
- The clavicular head also acts individually to flex the upper limb.
Innervation: Lateral and medial pectoral nerves
Action and innervation of the pectoralis minor
Action: Stabilises the scapula by drawing it anteroinferiorly against the thoracic wall.
Innervation: Medial pectoral nerve
Action and innervation of the serratus anterior
Function: Rotates the scapula, allowing the arm to be raised over 90 degrees. It also holds the scapula against the ribcage.
Innervation: Long thoracic nerve. (SALT) – LESION = WINGS
Action and innervation of the subclavius
Function: Anchors and depresses the clavicle.
Innervation: Nerve to subclavius.
What are the three main ligaments that strengthen the acromioclavicular joint?
Acromioclavicular ligament
Coracoclavicular ligaments: conoid and trapezoid
What are the extrinsic muscles of the shoulder?
Superficial: Trapezium
Superficial: Latissimus dorsi
Deep: Levator scapulae
Deep: Rhomboid major and minor
What is the innervation and action of the trapezius? Upper, middle and lower fibres.
Upper fibres: elevate the scapula and rotates it during ABduction of the arm
Middle fibres: retract the scapula
Lower fibres: pull scapula inferiorly
INNERVATION: ACCESSORY NERVE
Innervation and action of latissimus dorsi
Nerve supply: thoracodorsal nerve
Action: extends, adducts, and medially rotates the upper limb
Innervation and action of the levator scapulae?
Nerve supply: dorsal scapular nerve
Actions: elevates the scapula
What is the nerve supply and action of the rhomboid minor and major?
Nerve supply: dorsal scapular nerve
Action: retract and rotates the scapula