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Beef is indeed cow muscle. The beef carcass is made up of over a hundred different muscles, each with distinct properties that impact processing and consumer preferences. These muscles are made up of bundles of cells called fibres, which contain filaments of two proteins: actin and myosin, which give the muscle its structure. The Infraspinatus muscle of the Flat Iron Steak is the second most tender muscle in the beef carcass. Tendons from distal muscles pass down the length of the cannon bone and are kept in place by ligamentous rings.
| Characteristics | Values |
|---|---|
| Number of muscles in a beef carcass | Over 100 |
| Muscle composition | 75% water, 19% protein, 2.5% intramuscular fat, 1.2% carbohydrates, 2.3% other substances (e.g. amino acids, minerals) |
| Muscle structure | Bundles of cells (fibers) containing filaments of two proteins: actin and myosin |
| Muscle types | Pennate, fusiform (cigar-shaped) |
| Tough meat sources | Distal muscles of the limbs due to high connective tissue content |
| Tender meat sources | Hindlimb muscles |
| Muscle examples | Longissimus costarum, multifidus dorsi, triceps brachii, biceps brachii, gastrocnemius, gluteus medius, gracilis, sartorius, infraspinatus |
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What You'll Learn
The beef carcass is made up of over 100 muscles
Beef is indeed derived from cows, and a beef carcass is made up of over 100 muscles. The muscles in a beef carcass have different properties, which affect how the meat is processed and how acceptable it is to consumers.
The muscles can be separated into different groups based on these characteristics, and this can help with marketing. For example, the infraspinatus, or top blade muscle, is the second most tender muscle in the carcass if correctly managed, and this knowledge resulted in the development of the beef Flat Iron Steak.
The value of a beef carcass is largely determined by the lean meat yield, which is a function of carcass fat percentage and carcass muscle-to-bone ratio. The weight and size of a carcass influence the quantity of the various tissues, as well as the size of the muscles exposed on cutting and the individual joints prepared.
The distribution of tissues through the carcass is important because there are significant differences in the quality and retail value of meat from different regions of the carcass. For example, the beef fillet steak (the psoas muscle) is worth nearly three times as much as stewing steak in the UK.
Meat from the shoulder or chuck region is easily identified by its group of muscles and bones. The triceps brachii is a large muscle located in the triangular area bounded by the ventral edge of the scapula and the posterior edge of the humerus. The distal muscles of the limbs produce tough meat because of their high content of connective tissue.
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Tendons from distal muscles pass down the cannon bone
Tendons are highly resistant to tearing but aren't stretchy, making them susceptible to injury when strained. They are mostly made of collagen, one of the most abundant proteins in the body, and also contain blood vessels and nerves. Tendons link muscles to bones and allow movement as muscles tighten and relax. They also help prevent muscle injury by absorbing some of the impact from movements like running and jumping.
Tendons from distal muscles passing down the cannon bone can be observed in beef and lamb carcasses. The cannon bone, also known as metacarpal bone Mc3, gets its name from its resemblance to the end of a cannon barrel in cross-section. Tendons from distal muscles pass down the length of the cannon bone and are kept in place by ligamentous rings. These distal muscles are primarily flexors and extensors. Extensors cause the toes to move forward when contracted, as in taking a new stride. Flexors, on the other hand, bend the limb during locomotion.
The cannon bone in beef has little to no meat on it and is typically discarded in the abattoir. The distal muscles produce tough meat due to their high content of connective tissue. These distal muscles also contain long tendons that extend towards the toes or phalanges. When these muscles are cut open, internal tendons can be observed, fanning outwards for the attachment of short muscle fiber bundles. This arrangement is called a pennate structure and is characteristic of distal muscles.
The cannon bone and its associated tendons are part of the distal limb anatomy in large animals, including bovines. The distal limb is susceptible to various conditions, such as tendonitis and bowed tendons. The digital tendon sheath that surrounds the superficial and deep digital flexor tendons can become inflamed, resulting in swelling on the palmar aspect of the proximal sesamoids. This inflammation is sometimes referred to as "wind puffs" or "wind galls."
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Muscle components include connective tissue like collagen and elastin
Connective tissue is one of the four primary types of animal tissue, alongside epithelial tissue, muscle tissue, and nervous tissue. It is found in between other tissues everywhere in the body, including the nervous system. The three meninges, membranes that envelop the brain and spinal cord, are composed of connective tissue.
Connective tissue membranes include the meninges, the three membranes covering the brain and spinal cord, and synovial membranes that line joint cavities. Mucous and serous membranes are epithelial with an underlying layer of loose connective tissue.
The organic portion or protein fibers found in connective tissues are either collagen, elastic, or reticular fibers. Collagen fibers provide strength to the tissue, preventing it from being torn or separated from the surrounding tissues. Tendons and ligaments are composed mainly of densely packed collagen fibers, which undergo no metabolic activity and do not require a blood supply. Collagen and elastin compose the dry mass of tendon connective tissue. Tendons are connective tissue structures comprised of a hierarchical arrangement of collagen molecules that arrange into collagen fibrils and then collagen fibers, which can be grouped into primary, secondary, and tertiary bundles.
Elastic fibers are made of the protein elastin and provide flexibility to the tissues. Each fiber can be stretched to approximately 150% of its resting length and return to its original size and shape. Elastic cartilage has a large amount of elastic fibers, giving it tremendous flexibility. The ears of most vertebrate animals contain this cartilage, as do portions of the larynx or voice box.
Reticular fibers are the third type of protein fiber found in connective tissues. This fiber consists of thin strands of collagen that form a network of fibers to support the tissue and other organs to which it is connected.
Dense connective tissue, also known as fibrous connective tissue, is subdivided into dense regular and dense irregular connective tissue. Dense regular connective tissue, found in structures such as tendons and ligaments, is characterized by collagen fibers arranged in an orderly parallel fashion, giving it tensile strength in one direction. Dense irregular connective tissue provides strength in multiple directions by its dense bundles of fibers arranged in all directions.
Loose connective tissue generally holds organs, anatomic structures, and tissues in place. It was previously defined as including areolar, reticular, and adipose tissues, although this has been revised to only include areolar tissue. Adipose tissue gives "mechanical cushioning" to the body, among other functions.
In meat animals, the meat derived from pennate muscles is quite tough because of their high connective tissue content. The distal muscles of the limbs produce tough meat because of their high content of connective tissue.
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Most animal muscle is 75% water, 19% protein, and 2.5% fat
Beef is a type of meat, which is commonly defined as animal tissue that is suitable for use as food. This includes all processed and manufactured products that might be prepared from these tissues. Meat is considered a source of high-quality protein. The word protein comes from the Greek word "proteios", meaning "primary", which suggests the importance of proteins to human nutritional well-being.
The muscle tissue in lean meat contains on average 70-75% water, 19-23% crude protein, 3-10% fat, as well as minerals and saccharides in the quantity of around 1% each. Moisture is the greatest single contributor to muscle weight and is easily lost from meat. Bound water, which is directly held by chemical bonds to the meat proteins, represents 4 to 5% of the total water found in muscle. Immobilized water, which is indirectly held by electrically charged reactive groups, can range from 35-75% of the water in meat. The remaining water is free water, which is held by muscle membranes and capillary action.
The biochemical properties of the major muscle components (i.e. myofibers, connective tissue, and adipose tissue) vary in their composition. The contractile properties of muscle fibres primarily depend on myosin heavy-chain isoforms (MyHCs) present within the thick filaments. In most mature mammalian skeletal striated muscles, four types of MyHC are expressed: I, IIa, IIx, and IIb. The ATPase activity of these MyHCs is related to the speed of contraction: slow (type I) and fast (types IIa, IIx, and IIb). Type I fibres exhibit low-intensity contractions but are resistant to fatigue. They predominate in postural and respiratory muscles.
The muscles of the hindlimb in beef carcasses are relatively large and produce a large volume of moderately tender meat. The gracilis, together with the small sartorius muscle anterior to the gracilis, may be used to orient hindlimb cuts of meat such as a beef round steak or a slice of ham.
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The triceps brachii is a large, triangular muscle
Beef is derived from cows, and the muscles in the carcass are what we consume as meat. One of the major muscles in the cow's carcass is the triceps brachii, a large, thick muscle found in the dorsal or posterior compartment of the upper arm. Its name, triceps or "three-heads", indicates that this large muscle is subdivided into three parts: the long head, the lateral head, and the medial head. These three heads converge to form a single tendon that attaches to the olecranon process, the bony prominence of the elbow, located on the upper portion of the ulna.
The triceps brachii is the only muscle in the posterior compartment of the arm, spanning almost the entire length of the humerus. It is located in the triangular area bounded by the ventral edge of the scapula and the posterior edge of the humerus. The apex of the triangle is found on the medial border of the humerus, above the insertion of the teres major, while the base connects the medial and lateral epicondyles of the humerus. The medial head has an additional attachment to the posterior aspect of the medial and lateral intermuscular septum.
The primary function of the triceps brachii is the extension of the forearm at the elbow joint. The long head of the triceps also contributes to the extension and adduction of the arm at the shoulder joint. The muscle is supplied with oxygen and nutrients by the branches of the deep brachial artery, which is a branch of the brachial artery itself. The superior ulnar collateral artery, arising from the brachial artery, also plays a role in supplying the triceps.
The triceps brachii is innervated by the radial nerve, which provides a separate branch for each head. The C6 root value of the radial nerve innervates the lateral head, C7 innervates the long head, and C8 supplies the medial head. The medial head of the triceps brachii is also innervated by the ulnar nerve, according to certain studies. Axillary nerve damage can impact the long head of the triceps, and ruptures of the triceps muscle are rare but typically associated with anabolic steroid use.
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Frequently asked questions
Yes, beef is cow muscle.
Offal, also known as variety or organ meat, includes the liver, kidney, heart, sweetbreads, tripe, gizzards, and brain.
Muscle tissue, on the other hand, consists mostly of water (75%), protein (19%), intramuscular fat (2.5%), carbohydrates (1.2%), and other substances like amino acids and minerals (2.3%).
Additionally, muscle tissue has a unique structure, with bundles of cells called fibers that contain filaments of two proteins: actin and myosin.
A beef carcass contains over a hundred different muscles, including the longissimus costarum, multifidus dorsi, gastrocnemius, gluteus medius, gracilis, and sartorius.
The tenderness of beef muscle depends on the amount of connective tissue present. Muscles with high connective tissue content tend to be tougher, while those with less connective tissue are more tender. For example, the Infraspinatus muscle found in Flat Iron Steak is known for its tenderness.
The structure and arrangement of muscle fibers can impact the appearance of beef cuts. For example, the triceps brachii muscle, located in the shoulder, has a large triangular shape and may look like multiple muscles when seen in a cut of meat.
