General Anatomy and Upper Limb Osteology

Vocabulary practice flashcards covering general human anatomy, skeletal divisions, orientation conventions, and osteology of the upper limb (clavicle, scapula, humerus, ulna, and hand).

Anatomy

The science that studies the form and structure of living organisms, derived from the Greek word anatomia (dissection); it differs from physiology, which focuses on functional processes.

Descriptive Anatomy

A branch of anatomy dedicated to the analytical study of individual organs, examining their specific morphology and internal structure using defined technical terminology.

Topographical Anatomy

A branch of anatomy functioning as a synthetic complement to descriptive anatomy, focusing on the study of anatomical regions and the structural relationships between organs.

Radiological Anatomy

A branch of anatomy that utilizes medical imaging modalities to explore and visualize internal anatomical structures.

Anatomical Zero Position

The universal reference posture of the human body defined by four criteria: an erect standing subject, horizontal gaze, upper limbs extended along the trunk, and thumbs directed laterally (outward).

Longitudinal Axis

An imaginary reference line ($XY$) oriented vertically through the body from top to bottom.

Transverse Axis

An imaginary reference line ($CD$) oriented horizontally through the body from left to right.

Sagittal Axis

An imaginary reference line ($AB$) oriented horizontally through the body from front to back.

Sagittal Plane

A vertical anteroposterior plane that divides the human body into right and left portions.

Frontal Plane

A vertical plane passing from left to right that divides the body into anterior (ventral) and posterior (dorsal) sections.

Transverse Plane

A horizontal orientation plane that divides the body into superior (upper) and inferior (lower) sections.

Medial

A directional term describing a structure positioned closer to the median sagittal plane (also termed internal).

Lateral

A directional term describing a structure positioned farther away from the median sagittal plane (also termed external).

Osteology

The branch of anatomy that studies the $206$ bones of the human skeleton, which are rigid structures composed of connective tissue and mineral salts.

Axial Skeleton

The division of the skeleton arranged along the body's longitudinal axis that provides support and organ protection, comprising the skull, vertebral column (spine), and thoracic cage.

Appendicular Skeleton

The skeletal division comprising the upper limbs (anchored to the trunk by the shoulder girdle) and the lower limbs (anchored by the pelvic girdle).

Long Bone

A bone whose length significantly exceeds its width and thickness, structurally comprising a shaft (diaphysis) and two articular ends (proximal and distal epiphyses).

Flat Bone

A bone in which thickness is markedly less than both length and width, such as the sternum and cranial vault bones.

Short Bone

A bone whose three dimensional axes are nearly equal in measurement, exemplified by the carpal bones of the wrist.

Irregular Bone

A bone exhibiting complex, non-uniform dimensions that do not fit into long, short, or flat classifications, such as vertebrae.

Thoracic Cage

The osseous framework of the thorax bounded anteriorly by the sternum, laterally by the ribs, and posteriorly by the thoracic vertebral column.

Clavicle

A long, paired, asymmetrical, subcutaneous bone elongated transversely in an italic 'S' shape, articulating medially with the sternum and laterally with the acromion of the scapula.

Subclavian Groove

A longitudinal channel situated along the middle portion of the inferior surface of the clavicle that serves as the insertion site for the subclavius muscle.

Conoid Tubercle and Trapezoid Line

Roughened bony projections situated on the lateral aspect of the clavicle's inferior surface that serve as attachment points for the coracoclavicular ligaments.

Costal Tuberosity of the Clavicle

A roughened impression positioned on the medial portion of the clavicle's inferior surface for the attachment of the costoclavicular ligament.

Scapula

A flat, paired, asymmetrical, triangular bone positioned at the posterosuperior thorax between the 2nd and 7th ribs, forming the shoulder girdle alongside the clavicle.

Subscapular Fossa

The broad, concave ventral (costal) surface of the scapula marked by $3$ to $4$ bony ridges that provides attachment for the subscapularis muscle.

Spine of the Scapula

A prominent transverse bony ridge on the dorsal scapular surface dividing it into a supraspinous fossa superiorly and an infraspinous fossa inferiorly, extending laterally as the acromion.

Coracoid Process

A projection resembling a half-flexed finger extending laterally from the superior (cranial) border of the scapula lateral to the suprascapular notch, providing sites for muscle and ligament attachment.

Glenoid Cavity

A shallow, oval, almost flat articular surface located at the lateral angle of the scapula that articulates with the humeral head.

Humerus

The long, paired, asymmetrical bone that forms the skeleton of the arm, articulating proximally with the scapula at the glenohumeral joint and distally with the radius and ulna at the elbow.

Deltoid Tuberosity

A prominent V-shaped elevation on the lateral surface of the humeral diaphysis that serves as the insertion site for the deltoid muscle.

Radial Nerve Groove

An oblique spiral groove winding across the posterior (dorsal) surface of the humeral shaft that transmits the radial nerve.

Surgical Neck of the Humerus

The constriction on the humerus located immediately distal to the greater and lesser tubercles, connecting the proximal epiphysis to the diaphysis and frequently subject to fractures.

Anatomical Neck of the Humerus

The groove directly encircling and circumscribing the articular humeral head, separating it from the greater and lesser tubercles.

Greater Tubercle of the Humerus

A prominent lateral bony projection on the proximal epiphysis of the humerus providing insertion for rotator cuff muscles.

Lesser Tubercle of the Humerus

An anteriorly directed elevation on the proximal epiphysis of the humerus providing insertion for the subscapularis muscle.

Intertubercular Sulcus

A vertical depression (bicipital groove) running between the greater and lesser tubercles of the humerus that transmits the tendon of the long head of the biceps brachii.

Trochlea of the Humerus

The medial pulley-shaped articular surface on the distal humerus that articulates with the trochlear notch of the ulna.

Capitulum of the Humerus

The smooth, rounded lateral articular prominence on the distal humerus that articulates with the fovea of the radial head.

Coronoid Fossa of the Humerus

An anterior depression on the distal humerus situated superior to the trochlea that receives the coronoid beak of the ulna during full elbow flexion.

Olecranon Fossa of the Humerus

A deep posterior depression on the distal humerus situated superior to the trochlea that accommodates the olecranon beak of the ulna during elbow extension.

Medial Epicondyle of the Humerus

A prominent non-articular medial projection of the distal humerus giving origin to medial epicondylar muscles anteriorly, featuring a posterior groove that transmits the ulnar nerve.

Pronation-Supination

Rotational movements of the forearm enabled by the reciprocal dimensions of the radius and ulna, joined by proximal and distal radioulnar joints and the interosseous membrane.

Interosseous Membrane of the Forearm

A strong, fibrous syndesmotic sheet uniting the interosseous borders of the radius and ulna throughout their length.

Ulna

The posteromedial long bone of the forearm exhibiting physiological valgus, characterized by a massive proximal end and a slender distal end.

Olecranon

A robust, curved bony process forming the posterosuperior aspect of the proximal ulna, ending in a beak anteriorly and providing an insertion for the triceps brachii muscle.

Coronoid Process of the Ulna

A horizontal, triangular bony projection on the anterior aspect of the proximal ulna that bears the ulnar tuberosity for the brachialis muscle and the lateral radial notch.

Trochlear Notch of the Ulna

A large, semi-lunar anterior articular cavity formed between the olecranon and coronoid process that articulates with the trochlea of the humerus.

Radial Notch of the Ulna

A smooth articular depression located on the lateral aspect of the coronoid process that receives the circumference of the radial head.

Ulnar Head

The rounded articular extremity at the distal end of the ulna that articulates with the ulnar notch of the radius and contacts the radioulnar disc.

Ulnar Styloid Process

A non-articular, cylindrical bony projection extending inferiorly from the posteromedial aspect of the distal ulna, providing attachment for the triangular ligament of the wrist.

Radioulnar Disc

A fibrocartilaginous structure (triangular ligament) separating the distal ulna from the carpal bones, preventing direct articulation between the ulna and the carpus.

Carpus

The skeletal segment of the wrist composed of eight short bones arranged in two transverse rows of four bones each.

Proximal Carpal Row

The four carpal bones ordered from lateral to medial: Scaphoid, Lunatum (lunate), Triquetrum, and Pisiform.

Distal Carpal Row

The four carpal bones ordered from lateral to medial: Trapezium, Trapezoid, Capitatum, and Hamatum.

Carpal Tunnel

A fibro-osseous canal formed between the concave anterior surface of the carpal bones and the flexor retinaculum, transmitting flexor tendons and the median nerve.

Metacarpus

The skeleton of the palm consisting of five miniature long bones numbered $I$ to $V$ from lateral (thumb) to medial (little finger).

Phalanges of the Hand

The $14$ miniature long bones of the digits, comprising two in the thumb and three in digits $II$ through $V$ (proximal $P_1$, middle $P_2$, and distal $P_3$), organized around a central functional axis passing through the third digit.