Diaphragm vs Quadriceps femoris
| Property | Diaphragm | Quadriceps femoris |
|---|---|---|
| Latin Name | Musculus diaphragma | Musculus quadriceps femoris |
| Type | Muscle | Muscle |
| Body System | Muscular | Muscular |
| Body Region | Thorax | Thigh |
| Function | The primary muscle of respiration. Contraction flattens the dome-shaped muscle, increasing thoracic volume and creating negative pressure to draw air into the lungs during inspiration. | The most powerful extensor of the knee joint. Essential for standing, walking, climbing stairs, and running. The rectus femoris also flexes the hip. |
| Clinical Significance | Diaphragmatic hernias allow abdominal organs to enter the thoracic cavity. Phrenic nerve paralysis causes diaphragmatic elevation. Hiccups result from involuntary diaphragmatic spasms. | Quadriceps tendon rupture prevents active knee extension. Vastus medialis oblique weakness contributes to patellar maltracking. Quadriceps atrophy commonly follows knee injuries and surgeries. |
| FMA ID | 13295 | 22428 |
Full structure pages
Diaphragm
Musculus diaphragma
The principal muscle of respiration, the diaphragm is a musculotendinous dome that separates the thoracic and abdominal cavities. When it contracts, the dome flattens, increasing thoracic volume and generating the negative pressure that draws air …
Quadriceps femoris
Musculus quadriceps femoris
A four-headed muscle group of the anterior thigh, the quadriceps femoris is the most powerful extensor of the knee and is central to standing, walking, climbing stairs, and running. Its four heads, the rectus femoris, …