Trochlea Articulation
Trochlea Articulation - Related Videos
01:28
Articulations of the Vertebral Column
0 Views •
2023
In addition to being held together by the intervertebral discs, adjacent vertebrae also articulate with each other at synovial joints formed between the superior and inferior articular processes called zygapophysial joints (facet joints). These are plane joints that provide for only limited motions between the vertebrae. The orientation of the articular processes at these joints varies in different regions of the vertebral column and serves to determine the types of motions available in each...
08:32
Ultrasound Images of the Tongue: A Tutorial for Assessment and Remediation of Speech Sound Errors
0 Views •
Cited by 41 •
2017
Ultrasound imaging can be used to display the shape and movements of the tongue in real time during speech. The images can be used to determine the nature of speech sound errors. Visual feedback of the tongue can be used to facilitate improvements in speech sound production in clinical populations.
08:58
Matrix-assisted Autologous Chondrocyte Transplantation for Remodeling and Repair of Chondral Defects in a Rabbit Model
0 Views •
Cited by 5 •
2013
An experimental technique for the treatment of chondral defects in the rabbit's knee joint is described. The implantation of autologous chondrocytes seeded on a matrix is a well-accepted method for the remodeling and repair of articular cartilage lesions providing satisfying long-term results. Matrix-assisted autologous chondrocyte transplantation (MACT) offers a standardized and clinically established implantation method.
08:13
The McGurk Effect
0 Views •
2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Spoken language, a singular human achievement, relies heavily on specialized perceptual mechanisms. One important feature of language perception mechanisms is that they simultaneously rely on auditory and visual information. This makes sense, because until modern times, a person could expect that most language would be heard in face-to-face interactions. And because producing specific speech sounds requires precise articulation,...
10:09
Elbow Exam
0 Views •
2023
Source: Robert E. Sallis, MD. Kaiser Permanente, Fontana, California, USA The elbow is a hinged joint that involves the articulation of 3 bones: the humerus, radius, and ulna. It is a much more stable joint than the shoulder, and because of that, the elbow has less range of motion. The elbow and its structures are prone to significant injuries, particularly with repetitive motion. Lateral and medial epicondylitis (also called tennis elbow and golfer's elbow) are two common diagnoses and often...
FAQs
The grooved, pulley-shaped surface channels the contacting bone along a predictable path. Because the convex trochlea fits into a matching concavity, the joint favors movement around one axis rather than unrestricted motion. This close geometric relationship illustrates how skeletal form determines movement and helps produce controlled flexion and extension.
Cartilage covers the contacting joint surfaces and reduces friction as the bones move against one another. Ligaments provide additional restraint by limiting side-to-side displacement. Together, these tissues support smooth motion while reinforcing the alignment created by the bony surfaces, linking low-friction movement with mechanical stability.
Its interlocking surfaces guide motion mainly along a single axis. That arrangement allows the joint to bend and straighten efficiently, while the surrounding ligaments restrict unwanted lateral displacement. The result is a balance between mobility and stability, rather than movement in several independent directions.
At the elbow, the humeral trochlea engages the ulna in a way that channels forearm movement. Its pulley-like form provides a structural explanation for the elbow’s controlled bending and straightening. This example allows biology students to connect bone shape with joint mechanics instead of considering movement as a function of muscles alone.
Analysis should include the humeral trochlea, the corresponding ulnar surface, the intervening cartilage, and the ligaments surrounding the joint. Examining these components together clarifies how surface matching guides motion, how cartilage limits friction, and how ligaments help prevent side-to-side displacement during forearm movement.
It shows how stability arises from several interacting features rather than from bone shape alone. The matching surfaces guide the main movement, cartilage supports smoother contact, and ligaments restrict lateral displacement. Considering these relationships helps explain why normal joint function depends on both controlled mobility and structural restraint.
The articulation provides a framework for examining how disruption of joint structure may affect movement and stability. Changes involving the contacting surfaces, cartilage, or supporting ligaments can be considered in relation to the joint’s normal mechanical roles. This makes the elbow a useful anatomical context for studying altered biomechanics associated with injury or degeneration.