Maximus Gage
Drawing back muscles can be challenging due to the intricate interplay of bones and muscles in the human back. The scapula, or shoulder blade, is the most crucial landmark for constructing the back, with its distinctive triangular shape and movement patterns. Artists must also consider the underlying rib cage and spine, which influence the appearance of muscles as they flex and stretch. Learning basic anatomy and studying reference images to identify muscle groups are essential steps in accurately depicting the back.
| Characteristics | Values |
|---|---|
| Muscle groups | Trapezius, Romboids, Deltoid |
| Bones | Scapula, Rib cage, Spine |
| Anatomy | Understand the bones and muscles, identify landmarks |
| Pose | The skeletal structure may be more visible than muscles depending on the pose |
| Movement | Bones move under the muscles, pushing them outward and creating new shapes |
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What You'll Learn
The importance of anatomy
Anatomy is of paramount importance when drawing the back muscles. The back is often perceived as simple, but the reality is that it involves a complex interplay of muscles and bones. A good understanding of anatomy is essential for creating accurate and dynamic depictions of the back muscles.
The back muscles, including the deltoid, latissimus dorsi, teres major, infraspinatus, and trapezius, are connected to the skeletal structure. The upper back muscles, for instance, attach to the spine and lie on top of the rib cage, with the shoulder girdle facilitating their movement. The scapula, or shoulder blade, is a crucial bony landmark that serves as a point of attachment for various back muscles. It is essential to understand the relationship between these muscles and the underlying bones, as well as how they overlap and interact with each other.
The shape-shifting nature of muscles as they are flexed and stretched is another important anatomical consideration. For example, when the scapulas are retracted, the muscles bulge and compress, creating a distinct visual effect. Additionally, the trapezius, a large muscle that partially wraps around the neck, attaches to the clavicle, forming the acromioclavicular joint. This joint creates a noticeable bump between the traps and the shoulders in a standing figure.
Furthermore, the study of anatomy enables artists to understand the three-dimensional forms of the back muscles and how they interact with light and shadow. By comprehending the underlying anatomy, artists can create more realistic and dynamic representations of the back. This knowledge can be applied to various artistic pursuits, including concept art, animation, illustration, and portraiture, enhancing the overall quality and accuracy of the artwork.
In conclusion, a solid understanding of anatomy is crucial for artists aiming to depict the back muscles accurately and dynamically. By studying the skeletal structure, muscle groups, and their interactions, artists can elevate their drawings to the next level, creating visually compelling and anatomically correct representations of the human back.
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The scapula and its movement
The scapula, commonly referred to as the shoulder blade, is a flat, triangular bone located at the back of the trunk, above the rib cage in the upper back. It is an important bone as it provides a point of attachment for several groups of muscles that make up the arm and shoulder. These include the rotator cuff muscles, teres major, subscapularis, teres minor, infraspinatus, triceps, biceps, deltoid, levator scapulae, trapezius, rhomboids, and serratus anterior.
The scapula plays a crucial role in shoulder movement and overall upper-body mobility and stability. It can move in six directions, each produced by specific primary muscles. When the arm is raised, the scapula turns upward, and when the arm is extended, the scapula glides to the side of the rib cage. It also moves back and slides to the side as the arm reaches out, pivoting with the bottom edge moving outward and up as the arm is raised.
The scapula is not always visible, especially on people with well-developed upper back muscles. It is most visible during pulling movements, and the upper and inner sides are usually the most noticeable.
To draw the scapula accurately, it is essential to understand its anatomical structure and how it moves in relation to the arm and shoulder. Begin by identifying the line of the spine and creating a frame around it. Then, add the scapula, connecting it to the humerus bones of the arm at the shoulder joint, and to the clavicle at the front. The spine of the scapula, with its protruding ridge, is a crucial landmark for drawing the shoulders. The trapezius muscles attach at the top of this ridge, while the shoulder (deltoid) muscles attach at the bottom.
By understanding the scapula's position and movement, artists can accurately depict the back and shoulders in various poses, ensuring that the muscles and bones are correctly positioned and oriented.
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The role of the rib cage
The rib cage, also known as the thoracic cage, is an essential component of the back's muscular structure. It is a cage-like structure of bones that wraps around the sides of the torso from front to back, consisting of 24 ribs, with 12 on each side. These ribs articulate with the vertebral column at the back and connect to the sternum (breastbone) in the front.
The primary function of the rib cage is to provide protection to the vital organs housed within the chest cavity, including the heart and lungs. Its solid yet flexible structure safeguards these organs from external impacts and injuries. Additionally, the rib cage plays a crucial role in ventilation, facilitating the expansion and contraction of the lungs during breathing.
The rib cage serves as an attachment point for various muscles, including the diaphragm, a core muscle essential for respiration. The quadratus lumborum, a square-shaped muscle in the lower back, also attaches to the rib cage, along with the spine and pelvis. This muscle is responsible for moving the trunk at the spinal joints and stabilizing the pelvis and lumbar spinal joints.
The muscles attached to the rib cage can be categorized into two functional groups based on their attachment points. If a muscle attaches to the rib cage and its other attachment is superior to the rib cage attachment, it can elevate the ribs at the sternocostal and costospinal joints. Conversely, if a muscle attaches to the rib cage and its other attachment is inferior, it can depress the ribs at these same joints. These muscles contract with inspiration and expiration, respectively, aiding in the breathing process.
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The upper back muscles
The upper back is a complex area to draw, with many muscles and bones to consider. The upper back muscles attach to the spine, lie on top of the ribcage, and are moved by the shoulder girdle. The scapula, or shoulder blade, is a crucial bone to understand, as it plays a significant role in the movement and positioning of the upper back muscles.
When drawing the upper back muscles, it is essential to understand their attachment points and how they interact with the surrounding bones. The upper back muscles, including the rhomboids and the trapezius, originate from the spine and insert into the scapula or humerus bone of the arm. Understanding the origin and insertion points of these muscles will help you accurately depict their form and movement in your drawings.
To create dynamic and lifelike drawings, it is crucial to capture the gesture and motion of the upper back muscles. This can be achieved by studying and understanding the underlying anatomy. For example, when the scapulas are retracted, the muscles between them bulge as they are flexed and compressed. Additionally, the muscles change shape as they are stretched and flexed, so incorporating squash and stretch techniques in your drawings will make them more realistic.
Practising quick sketches of the upper back in different poses can help you understand the motion and form of the muscles. By using an app or a mannequinization exercise, you can invent the muscle structures on top of the skeletal framework. This will test your knowledge, as you will have no reference to work from, forcing you to rely on your understanding of the anatomy.
Lastly, when drawing the upper back muscles, it is beneficial to vary your line types. Avoid using the same curve in repetition, as this can make your drawings appear stiff. Instead, incorporate straights and angles to create more natural and solid forms.
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Practising gestures
Gesture drawing is a fantastic way to increase your artistic skill and is a great foundation skill. Gesture drawings are traditionally created in an extremely short amount of time, usually 30 seconds, but no more than two minutes. This is to avoid getting too detailed too soon, which can lead to heavily rendered individual body parts that don't work as a whole. By starting with short drawings, you can train yourself to work up a general picture before moving on to the details.
To begin gesture drawing, start with a single stroke called the "line of action". This will help you place emphasis on the movement, action, and direction of the pose. Your drawing may just look like a few arcing lines, but the point is to train your brain to understand the pose as a whole, and the direction, energy, or twists that make it interesting and alive.
To build your gesture skills, try the following exercise: set a timer for 2.5 minutes and draw a pose. As you draw, observe the figure and simplify it into what really matters. Take note of the major angles you see, such as the angle of the rib cage against the pelvis. Look for how the big shapes overlap each other, and don't worry about light and shadow. After the 2.5 minutes, take a new sheet of paper and try to redraw the pose from memory. Take 30 seconds to compare your two drawings. What changed when you drew from memory?
When drawing the back muscles, it's important to understand the anatomy of the back. The upper back muscles attach to the spine, lie on top of the rib cage, and are moved around by the shoulder girdle. When the scapulas are retracted, show how the muscles bulge up between them as they are flexed and compressed. You can also try the mannequinization exercise from the Figure Drawing Fundamentals course, which will help you understand where each muscle originates and inserts.
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Frequently asked questions
Learning the basics of anatomy is key to drawing back muscles accurately. The scapula, or shoulder blade, is the most important for the construction of the back. It is triangular in shape and is most visible on skinny people or during pulling movements. The upper back muscles attach to the spine, lie on top of the rib cage, and are moved around by the shoulder girdle.
Gvaat's Workshop offers a step-by-step construction guide for drawing the human back, which includes simplified anatomy for beginners and intermediates. Proko also offers a course on drawing upper back muscles with a focus on anatomy and motion.
When drawing back muscles, it can be helpful to start by indicating the bones, as the skeletal forms have a huge impact on how things look. Remember that muscles change shape as they are flexed and stretched, so try to show this in your drawing. It can also be helpful to study photos and try to identify the different muscle groups.
