Chapter 1 - Atlas A.2 - Study Guide - Assess Your Learning Outcomes - Page 38: 4

In anatomy, the terms "arm" and "leg" have specific anatomical meanings that differ from their colloquial usage. The upper and lower limbs are divided into segments, each with distinct names and functions: **Upper Limb (Arm)**: 1. **Arm** (Colloquial): - In everyday language, "arm" typically refers to the entire upper limb, including the shoulder, upper arm, forearm, and hand. 2. **Arm** (Anatomical): - In anatomy, the term "arm" specifically refers to the part of the upper limb between the shoulder and elbow joints. It consists of two bones: the humerus (upper arm bone) and the radius and ulna (forearm bones). 3. **Forearm**: - The forearm is the portion of the upper limb between the elbow and wrist joints. It contains the radius and ulna bones. 4. **Hand**: - The hand includes the wrist, palm, fingers, and thumb. It is the distal part of the upper limb. **Lower Limb (Leg)**: 1. **Leg** (Colloquial): - In everyday language, "leg" often refers to the entire lower limb, including the hip, thigh, lower leg, and foot. 2. **Leg** (Anatomical): - In anatomy, the term "leg" specifically refers to the part of the lower limb between the knee and ankle joints. It consists of two bones: the tibia (shinbone) and the fibula (a thinner bone beside the tibia). 3. **Thigh**: - The thigh is the portion of the lower limb between the hip and knee joints. It contains the femur (thighbone), the body's longest and strongest bone. 4. **Calf**: - The calf is the part of the lower limb located between the knee and ankle joints. It contains the tibia and fibula bones as well as muscles like the gastrocnemius and soleus. 5. **Foot**: - The foot includes the ankle, heel, arch, sole, toes, and toenails. It is the distal part of the lower limb and is responsible for weight-bearing and locomotion. In summary, the anatomical meanings of "arm" and "leg" refer to specific segments of the upper and lower limbs, respectively. In contrast, their colloquial meanings often encompass the entire limb. It's essential to understand these distinctions, especially in medical and anatomical contexts, to accurately describe and discuss specific parts of the upper and lower limbs.

In anatomy, the terms "arm" and "leg" have specific anatomical meanings that differ from their colloquial usage. The upper and lower limbs are divided into segments, each with distinct names and functions: **Upper Limb (Arm)**: 1. **Arm** (Colloquial): - In everyday language, "arm" typically refers to the entire upper limb, including the shoulder, upper arm, forearm, and hand. 2. **Arm** (Anatomical): - In anatomy, the term "arm" specifically refers to the part of the upper limb between the shoulder and elbow joints. It consists of two bones: the humerus (upper arm bone) and the radius and ulna (forearm bones). 3. **Forearm**: - The forearm is the portion of the upper limb between the elbow and wrist joints. It contains the radius and ulna bones. 4. **Hand**: - The hand includes the wrist, palm, fingers, and thumb. It is the distal part of the upper limb. **Lower Limb (Leg)**: 1. **Leg** (Colloquial): - In everyday language, "leg" often refers to the entire lower limb, including the hip, thigh, lower leg, and foot. 2. **Leg** (Anatomical): - In anatomy, the term "leg" specifically refers to the part of the lower limb between the knee and ankle joints. It consists of two bones: the tibia (shinbone) and the fibula (a thinner bone beside the tibia). 3. **Thigh**: - The thigh is the portion of the lower limb between the hip and knee joints. It contains the femur (thighbone), the body's longest and strongest bone. 4. **Calf**: - The calf is the part of the lower limb located between the knee and ankle joints. It contains the tibia and fibula bones as well as muscles like the gastrocnemius and soleus. 5. **Foot**: - The foot includes the ankle, heel, arch, sole, toes, and toenails. It is the distal part of the lower limb and is responsible for weight-bearing and locomotion. In summary, the anatomical meanings of "arm" and "leg" refer to specific segments of the upper and lower limbs, respectively. In contrast, their colloquial meanings often encompass the entire limb. It's essential to understand these distinctions, especially in medical and anatomical contexts, to accurately describe and discuss specific parts of the upper and lower limbs.