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To solve this skeletal system labeling worksheet, we will go through the diagram from top to bottom, matching each arrow to the correct bone name from the Word Bank.

Step 1: The Head and Neck
* Top of the skull: The arrow points to the main part of the skull that protects the brain. This is the Cranium.
* Cheek/Jaw area (left side): The arrow points to the upper jaw bone. This is the Maxilla.
* Lower Jaw (right side): The arrow points to the lower jaw bone. This is the Mandible.

Step 2: The Shoulder and Chest
* Shoulder blade (left side): The arrow points to the flat triangular bone at the back of the shoulder. This is the Scapula.
* Collarbone (right side): The arrow points to the bone connecting the arm to the body at the front. This is the Clavicle.
* Breastbone (center chest): The arrow points to the flat bone in the center of the chest where ribs attach. This is the Sternum.
* Ribs (left side): The arrow points to the curved bones protecting the chest organs. These are the Ribs.

Step 3: The Spine and Hips
* Backbone (center back): The arrow points to the series of bones making up the spine. These are the Vertebrae.
* Hip bone (left side): The arrow points to the large basin-shaped bone structure. This is the Pelvis.
* Base of spine (center lower back): The arrow points to the triangular bone at the base of the spine, between the hip bones. This is the Sacrum.

Step 4: The Arms and Hands
* Upper Arm (right side): The arrow points to the long bone in the upper arm. This is the Humerus.
* Forearm outer bone (left side): The arrow points to the bone on the thumb side of the forearm. This is the Radius.
* Forearm inner bone (right side): The arrow points to the bone on the pinky side of the forearm. This is the Ulna.
* Hand bones (left side): The arrow points to the bones in the palm of the hand. These are the Metacarpals.
* Finger bones (right side): The arrow points to the bones in the fingers. These are the Phalanges.

Step 5: The Legs and Feet
* Thigh bone (left side): The arrow points to the longest bone in the body, located in the thigh. This is the Femur.
* Kneecap (right side): The arrow points to the small round bone covering the knee joint. This is the Patella.
* Shin bone (left side): The arrow points to the larger, inner bone of the lower leg. This is the Tibia.
* Calf bone (right side): The arrow points to the thinner, outer bone of the lower leg. This is the Fibula.
* Ankle/Foot bones (left side): The arrow points to the cluster of bones forming the ankle and heel. These are the Tarsals.
* Foot bones (right side): The arrow points to the long bones in the foot leading to the toes. These are the Metatarsals.

Final Answer:
Here are the labels for the skeletal system diagram, listed generally from top to bottom, left to right:

1. Cranium (Top of head)
2. Maxilla (Upper jaw)
3. Mandible (Lower jaw)
4. Scapula (Shoulder blade)
5. Clavicle (Collarbone)
6. Sternum (Breastbone)
7. Ribs
8. Humerus (Upper arm)
9. Vertebrae (Spine)
10. Pelvis (Hip bone)
11. Sacrum (Base of spine)
12. Radius (Forearm - thumb side)
13. Ulna (Forearm - pinky side)
14. Metacarpals (Hand/Palm)
15. Phalanges (Fingers)
16. Femur (Thigh)
17. Patella (Kneecap)
18. Tibia (Shin)
19. Fibula (Calf/Lower leg outer)
20. Tarsals (Ankle/Heel)
21. Metatarsals (Foot)