Ch. 6 The Muscular System

Marieb - Essentials of Human Anatomy & Physiology 13th Edition

Marieb13th EditionEssentials of Human Anatomy & PhysiologyISBN: 9780135624340Not the one you use?Change textbook

Marieb 13th Edition

Ch. 6 The Muscular System

Problem 17

Chapter 6, Problem 17

Name three muscles or muscle groups used as sites for intramuscular injections. Which is most often used in babies?

Verified step by step guidance

Step 1: Understand the concept of intramuscular injections. Intramuscular injections are administered directly into the muscle tissue, which allows for rapid absorption of medication due to the rich blood supply in muscles.

Step 2: Identify common muscles or muscle groups used for intramuscular injections. These include: (1) the deltoid muscle in the upper arm, (2) the vastus lateralis muscle in the thigh, and (3) the gluteus medius muscle in the buttocks.

Step 3: Consider the anatomical and physiological factors that influence the choice of injection site. For example, the deltoid muscle is often used for adults due to its accessibility, while the gluteus medius is preferred for larger volumes of medication.

Step 4: Determine the most commonly used site for intramuscular injections in babies. The vastus lateralis muscle in the thigh is typically chosen for infants because it is well-developed at birth, easily accessible, and avoids major nerves and blood vessels.

Step 5: Review the importance of proper technique and site selection to minimize complications, such as nerve damage or improper absorption, and ensure the effectiveness of the medication.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Intramuscular Injection Sites

Intramuscular injections are administered directly into the muscle tissue, allowing for faster absorption of medication into the bloodstream. Common sites include the deltoid muscle in the upper arm, the vastus lateralis in the thigh, and the gluteus maximus in the buttock. Each site has specific anatomical considerations that affect the choice of injection site based on the patient's age, size, and the volume of medication.

Deltoid Muscle

The deltoid muscle is located in the upper arm and is commonly used for intramuscular injections in adults. It is easily accessible and allows for the administration of small volumes of medication. However, it is not typically used for infants due to the smaller muscle mass and the risk of injury to the underlying structures.

Vastus Lateralis Muscle

The vastus lateralis muscle is part of the quadriceps group located on the outer thigh and is the preferred site for intramuscular injections in infants and young children. This muscle is well-developed even in babies, making it safe for larger volumes of medication. Its accessibility and lower risk of injury to nerves and blood vessels make it an ideal choice for pediatric injections.

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