00:00The human skeleton is broadly divided into two main groups.
00:03The axial skeleton forms the central axis of the body,
00:07providing support and protection for vital organs.
00:11The appendicular skeleton, on the other hand,
00:14comprises the bones of the limbs and the girdles that attach them to the axial skeleton.
00:20These appendicular bones are crucial for movement, manipulation, and locomotion.
00:25They include the shoulder girdle, the upper limbs, the pelvic girdle, and the lower limbs.
00:31Understanding their structure and function is fundamental to comprehending human anatomy and biomechanics.
00:38The pectoral or shoulder girdle consists of two bones, the scapula and the clavicle.
00:44This girdle serves as the connection point between the upper limbs and the axial skeleton.
00:49It provides a stable base for the extensive range of motion seen in the arm.
00:55The shoulder girdle also offers numerous attachment sites for muscles.
00:59These muscles are responsible for moving the shoulders and the entire upper limb.
01:05Its design allows for both strength and flexibility, essential for daily activities.
01:11The upper limbs include the bones of the arm, forearm, wrist, and hand.
01:16The humerus is the single bone of the arm, extending from the shoulder to the elbow.
01:22It articulates proximally with the scapula and distally with the forearm bones.
01:27The forearm contains two bones, the radius and the ulna.
01:31These bones articulate with the humerus at the elbow joint.
01:35The ulna is generally considered the larger of the two forearm bones, particularly at its proximal end.
01:41The wrist, also known as the carpus, is composed of eight carpal bones.
01:47These small, irregularly shaped bones are arranged in two rows.
01:52A common mnemonic to remember them is, some lovers try positions that they can't handle.
01:57The eight carpal bones are the scaphoid, lunate, triquetral, pisiform, trapezoid, trapezium, capitate, and hamate.
02:07Distal to the carpals are the hand bones.
02:10The hand includes five metacarpals, which form the palm, and 14 phalanges, which make up the fingers and thumb.
02:16The pelvic girdle is a robust ring of bones that connects the lower limbs to the axial skeleton.
02:23It is firmly attached to the vertebral column, providing strong support for the upper body.
02:29The pelvic girdle consists of two large hip bones, one on each side.
02:34Each hip bone is a complex structure formed by the fusion of three distinct bones, the ilium, the ischium, and the pubis.
02:41These fused bones create a stable basin that protects internal organs and transmits weight to the lower limbs.
02:49The male and female pelvises exhibit notable differences, primarily due to adaptations for childbirth in females.
02:57The female pelvic brim, which defines the inlet to the true pelvis, is typically larger and wider than that of a male.
03:05This wider opening facilitates the passage of a baby during birth.
03:09Furthermore, the angle of the pubic arch is significantly greater in the female pelvis, usually exceeding 90 degrees.
03:17In contrast, the male pubic arch is narrower, generally less than 90 degrees.
03:23The male pelvis is also typically deeper, with a more constricted pelvic outlet, compared to the female pelvis.
03:30The lower limbs consist of the bones of the thigh, leg, and foot.
03:33The femur, the longest and strongest bone in the body, is the sole bone of the thigh.
03:39It articulates proximally with the hip bone and distally with the leg bones at the knee.
03:45The leg contains two bones, the tibia and the fibula.
03:49The tibia, commonly known as the shin bone, is the larger and medial bone, bearing most of the body's weight.
03:57The fibula is a slender bone located laterally to the tibia.
04:01The patella, or kneecap, is a sesamoid bone that protects the knee joint and enhances the leverage of the quadriceps tendon.
04:09The foot is a complex structure designed for weight-bearing, propulsion, and shock absorption.
04:16It comprises three main groups of bones, the tarsals, metatarsals, and phalanges.
04:22The ankle, or tarsus, consists of seven tarsal bones.
04:27These tarsal bones include the calcaneus, talus, cuboid, navicular, and three cuneiforms.
04:33Distal to the tarsals are the five metatarsals, which form the arch of the foot.
04:37The toes are made up of phalanges, with five proximal, five distal, and four middle phalanges, as the big toe has only two.
04:46The human foot possesses intricate arches formed by the interlocking arrangement of its bones and supporting ligaments.
04:54These arches are crucial for the foot's function, acting as natural shock absorbers during movement.
05:01They also play a vital role in distributing body weight evenly across the foot.
05:05There are two primary types of arches, longitudinal and transverse.
05:11The longitudinal arch runs from the calcaneus to the heads of the metatarsals, with distinct medial and lateral parts.
05:18The transverse arch extends across the foot, spanning the cuneiforms and the bases of the metatarsal bones.
05:24The transverse arch won't be one of them.
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