Functional Anatomy: An Introduction to Dynamic Movement & Human Mechanics

Flashcards helping students review functional anatomy concepts, anatomical pioneers, movement terminology, tissue layers, and joint/muscle mechanics.

Who was Herophilus, and what were his key contributions to anatomy?

Herophilus (335–280 BCE) of Alexandria is known as 'The Father of Anatomy.' He performed the first recorded systematic human dissections and distinguished and identified the brain, nerves, and blood vessels.

Who was Andreas Vesalius, and how did he impact the study of human anatomy?

Andreas Vesalius (1514–1564 CE) is recognized as the 'Founder of Modern Anatomy.' He systematically corrected long-standing anatomical errors from Galen and advocated for direct human dissection as primary proof.

How does 'Dead' Anatomy differ from 'Functional' Anatomy?

'Dead' Anatomy focuses on structural dissection in deceased subjects, analyzing isolated structures and tracing fiber origins/insertions. 'Functional' Anatomy evaluates dynamic systems in living subjects using real-time visualization (like EMG and ultrasound) to observe whole-body integration and dynamic movement.

What is the traditional 'dead' action of the rotator cuff group versus its functional role?

In isolated 'dead' anatomy, the rotator cuff is defined by external rotation (open-chain movement). Functionally, it decelerates a baseball pitch and maintains the stability of the shoulder girdle during dynamic movement.

What is the traditional 'dead' action of the hamstring group versus its real-world functional role?

In isolated 'dead' anatomy, the hamstrings flex the knee and extend the hip. Functionally, they decelerate the lower extremity during running and kicking, while mediating and absorbing reciprocal forces from the quadriceps.

What are the roles of Agonist, Synergist, and Antagonist muscles during elbow flexion?

The Agonist performs the desired movement (Brachialis and Biceps Brachii), the Synergist helps the movement (Radiobrachialis), and the Antagonist works against or controls the movement (Triceps).

Which connective tissue layers and structural components surround muscle fibers in this diagram?

Epimysium (deep fascia) wraps around the entire muscle belly, Perimysium envelops each fascicle (bundle of fibers), and Endomysium surrounds individual muscle fibers, which attach via a tendon to the bone periosteum.

What is a tendon and what is its primary function?

A tendon connects muscle to bone. Composed of collagen fibers connected to the greater fascial network, its function is transmitting muscle forces to move bones.

What is a ligament and what is its primary function?

A ligament connects bone to bone. Made of collagen fibers linked to the fascial network, it functions to reinforce joint stability.

What are the two types of fascia and their respective functions?

Superficial Fascia is located in the subcutaneous layer and allows skin to move freely over underlying muscles. Deep Fascia is a dense, organized layer that envelops muscles, bones, nerves, and vessels, forming intermuscular septa and muscle compartments to provide structural integrity.

What is a retinaculum?

A retinaculum consists of specialized ligaments whose function is not specifically to hold bones together, but to keep tendons in place.

What role do bursae play in the musculoskeletal system?

Bursae act as the 'furniture gliders' and 'airbags' of the musculoskeletal system, reducing friction and cushioning movement between structures.

Which directional movement terms are illustrated by the red arrows in this figure?

The upper arrow pointing toward the head represents Superior, while the lower arrow pointing toward the feet represents Inferior.

What do the terms Anterior and Posterior signify as demonstrated in this diagram?

Anterior refers to structures toward the front of the body (such as the sternum), whereas Posterior refers to structures toward the back of the body (such as the spine).

What is the difference between Proximal and Distal positional terms as shown here?

Proximal ('P') means closer to the trunk of the body, whereas Distal ('D') means further from the trunk of the body.

How are Superficial and Deep structures defined, using the pectoral muscles depicted here as an example?

Superficial refers to structures easily visible near the surface without moving much tissue (e.g., Pectoralis Major). Deep refers to structures only visible once overlying tissue obstructions are removed (e.g., Pectoralis Minor).

How is the skeletal system divided, and what percentage of total body weight does bone represent?

The skeletal system is divided into the Axial skeleton (cranium, vertebral column, ribs, sternum, hyoid bone) and the Appendicular skeleton (arms, legs, shoulder girdle, pelvic girdle). Bone is as strong as steel pound for pound and makes up 15% of body weight.

Which joint type is depicted in this image and what movement does it permit?

This is a Ball and Socket joint (such as the Glenohumeral Joint), which allows movement in every plane.

What type of joint is the Humeroulnar joint, and what movements does it allow?

The Humeroulnar joint is a Hinge Joint, which allows flexion and extension only.

Which type of joint is shown here and what is its characteristic action?

This is a Pivot Joint (such as the Atlantoaxial joint), which allows one bone to rotate on another.

What are Gliding Joints, and where are they located?

Gliding Joints are the least mobile joints in the body, found between the Carpals and Tarsals.

What five features of a muscle can be inferred from its name?

A muscle's name can give clues to its shape (e.g., rhomboid), location (e.g., temporalis), fiber direction (e.g., obliques), action (e.g., adductor brevis), and attachment sites (e.g., sternocleidomastoid).

How do muscle origins and insertions typically differ?

The origin of a muscle is typically more stationary, whereas the insertion is more mobile. Both attach to bones via tendons.

How strong is an individual muscle fiber relative to its size?

A single muscle fiber is thinner than a human hair, but it can support up to 1,000 times its own weight.

What major nerve junctions (plexuses) exist in the body, and how are CNS/PNS and Somatic/Autonomic defined?

Major nerve junctions include the Cervical, Brachial, Lumbar, and Sacral plexuses. CNS vs PNS represents Central Command versus messengers, while Somatic vs Autonomic represents conscious control versus unconscious control.