Humerus Flashcards
Type of Bone
Long Bone
How to Distinguish L from R
Head Faces Medially toward Body
3 Fossae at Distal end - One Faces Posterior, 2 Face Anterior
Which 3 Joints are Associated with the Humerus
Glenohumeral
Humeroradial
Humeroulnar
Describe the Articulating Surfaces of the GH Jt
Glenoid Fossa of Scapula and Head of Humerus
Describe the Articulating Surfaces of the Humeroradial Jt
Capitulum of the Humerus and Head of Radius
Describe the Articulating Surfaces of the Humeroulnar Jt
Trochlea of the Humerus Received by the Trochlear Notch of the Ulna
Structural Classification of GH Jt
Synovial Ball and Socket
Structural Classification of Humeroradial Jt
Synovial Atypical Ball and Socket
Structural Classification of Humeroulnar Jt
Synovial Hinge
Associated Muscle Actions (6)
1) Humeral Flexors (Biceps Brachii, Brachialis, Coracobrachialis, and Deltoids)
2) Humeral Extensors (Triceps Brachii, Deltoids, and Latissimus Dorsi)
3) Humeral Medial Rotators (Teres Major and Subscapularis)
4) Humeral Lateral Rotators (Teres Minor and Infraspinatus)
5) Humeral ABductors (Deltoids and Supraspinatus)
6) Humeral ADductors (Teres Major, Pectoralis Major, and Coracobrachialis)
Palpable Landmarks (9)
1) Necks
2) Greater Tubercle
3) Lesser Tubercle
4) Bicipital Groove
5) Deltoid Tuberosity
6) Supracondylar Ridges
7) Epicondyles
8) Ulnar Groove
9) Olecranon Fossa
2 Necks of Humerus
Anatomical
Surgical
Location and Function of Anatomical Neck
L: Proximal Epiphyses, Above the Tubercles
F: Attachment for GH Joint Capsule
*Former site of epiphyseal growth plate in adults
Location and Function of Surgical Neck
L: Proximal Epiphyses, Below Tubercles
Where head tapers into shaft
F: N/A
Common Site of Humeral Fractures
Surgical Neck
Location and Function of Greater Tubercle
L: Large Blunt Rise on Proximal Lateral Shaft
F: MA - Supraspinatus, Infraspinatus, and Teres Minor
Creates Lateral Lip of Bicipital Groove
Location and Function of Lesser Tubercle
L: Smaller Blunt Rise on Proximal Lateral Shaft
F: MA - Subscapularis
Creates Medial Lip of Bicipital Groove
Location and Function of Bicipital Groove (Intertubercular Sulcus)
L: Between Greater and Lesser Tubercles
Biceps Brachii (Long Head) Tendon Lies along and
Forms this Groove
F: MA - Teres Major, Latissimus Dorsi, and Pectoralis Major
Location and Function of Deltoid Tuberosity
L: Roughened Area on Lateral Shaft
F: MA - Deltoids
Function of Medial Supracondylar Ridge/Crest
MA: Brachialis and Triceps Brachii
Function of Medial Epicondyle
MA: CFT, Pronator Teres, Flexor Carpi Radialis, Palmaris Longus, Flexor Carpi Ulnaris, and Flexor Digitorum Superficialis
LA: Ulnar/Medial Collateral Lig.
Function of Lateral Supracondylar Ridge/Crest
MA: Brachioradialis and Extensor Carpi Radialis Longus
Function of Lateral Epicondyle
MA: Aconeus, Supinator, CET, Extensor Carpi Radialis Brevis, Extensor Digitorum, Extensor Digiti Minimi, and Extensor Carpi Ulnaris
LA: Radial/Lateral Collateral Lig.
Location and Function of Ulnar Groove
L: Distal and Posterior to Medial Epicondyle
F: Pathway formed by Ulnar Nerve
Function of Olecranon Fossa
F: Receives Olecranon Process of Ulna in Elbow Extension
Non-Palpable Landmarks (6)
1) Head
2) Trochlea
3) Capitulum
4) Radial Fossa
5) Coronoid Fossa
6) Radial Groove
Location and Function of Humerus Head
L: Rounded Joint surface at Proximal End
F: Joint Surface (GH Jt)
Location and Function of Trochlea
L: On Medial Condyle
F: Joint Surface (Humeroulnar Jt) Received by Trochlea Notch of Ulna
Location and Function of Capitulum
L: On Lateral Condyle
F: Joint Surface (Humeroradial Jt) Received by Head of Radius
Location and Function of Radial Fossa
L: Distal Anterior Humerus
F: Receives Head of Radius in Humeroradial Jt Flexion
Location and Function of Coronoid Fossa
L: Distal Anteromedial
F: Receives Coronoid Process of Ulna in Flexion
Location and Function of Radial Groove
L: Shallow Oblique Depression on Posterior Shaft of Humerus; Runs Posterior to Lateral
F: Impression for Radial Nerve
