15.5
Muscles axiaux et appendiculaires
Les muscles squelettiques, acteurs clés du mouvement de notre corps, peuvent être classés en deux groupes en fonction de leur emplacement et de leur f…
Les muscles squelettiques sont principalement divisés en deux groupes : l’axial et l’appendiculaire.
Les muscles axiaux présents le long de la ligne médiane du corps sont principalement reliés aux régions de la tête, du cou et du tronc.
Dans la tête et le cou, les muscles axiaux sont essentiels pour les expressions faciales, la parole, l’alimentation et divers mouvements de la tête.
De plus, certains muscles du cou aident les muscles postérieurs du tronc, communément appelés muscles du dos, dans les mouvements de la colonne vertébrale.
Les muscles thoraciques, ainsi que les muscles abdominaux tels que le droit, l’oblique et le transverse, établissent les parois antérolatérales du tronc.
Enfin, le squelette axial inférieur a des muscles qui s’étendent entre le sacrum et la ceinture pelvienne, créant le plancher pelvien.
D’autre part, les muscles appendiculaires sont ceux associés à la ceinture pectorale, à la ceinture pelvienne et aux membres.
Ces muscles stabilisent et soutiennent les structures en mouvement pendant la marche, la course et d’autres activités physiques.
Les muscles appendiculaires liés au membre supérieur vont des épaules aux mains, tandis que les muscles des membres inférieurs vont des hanches aux pieds.
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Q1: What is the main difference between axial and appendicular muscles?
Axial muscles are located along the body's midline and connect to the axial skeleton, including the skull, spine, ribs, and sternum. They control facial expressions, head and neck movements, speaking, and eating. Appendicular muscles, by contrast, attach to the pectoral girdle, pelvic girdle, and limbs, providing stability and enabling movement during activities like walking and running.
Q2: Which axial muscles form the walls of the trunk?
The thoracic muscles and abdominal muscles, including the rectus, oblique, and transverse muscles, form the anterolateral walls of the trunk. These muscles of the abdomen provide structural support and stability to the torso, protecting internal organs and enabling trunk movements and breathing.
Q3: What role do axial muscles play in head and neck movements?
Axial muscles in the head and neck are vital for facial expressions, talking, and eating. Additionally, some neck muscles work with posterior trunk muscles to assist in movements of the vertebral column. These muscles of the vertebral column coordinate to enable flexion, extension, and rotation of the spine.
Q4: How do appendicular muscles support limb movement?
Appendicular muscles stabilize and support moving structures during physical activities like walking and running. Upper limb muscles extend from the shoulders to the hands, enabling precise hand movements. Lower limb muscles stretch from the hips to the feet, providing mobility and balance during locomotion and weight-bearing activities.
Q5: What muscles form the pelvic floor?
The lower axial skeleton contains muscles that extend between the sacrum and pelvic girdle, creating the pelvic floor. These muscles of the pelvic floor and perineum provide support for pelvic organs and contribute to core stability during movement and posture maintenance.
Q6: Where are appendicular muscles located in the upper and lower limbs?
Upper appendicular muscles extend from the shoulders down to the hands, enabling intricate tasks and arm movements. Lower appendicular muscles stretch from the hips to the feet, ensuring mobility and balance. Both regions contain muscles that attach to the pectoral and pelvic girdles, respectively, allowing coordinated limb function.
Q7: How do axial muscles contribute to facial expressions and eating?
Axial muscles in the head and neck are essential for creating facial expressions and controlling jaw and mouth movements during eating. These muscles for facial expressions work in coordination with muscles around the mouth and eyes to produce the varied expressions humans use for communication and food manipulation.